769 lines
20 KiB
C++
769 lines
20 KiB
C++
/* Memory utilities for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_MEMORY_HH
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#define OSTD_MEMORY_HH
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#include <stddef.h>
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#include <new>
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#include <memory>
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#include "ostd/utility.hh"
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#include "ostd/type_traits.hh"
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namespace ostd {
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/* address of */
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template<typename T> constexpr T *address_of(T &v) noexcept {
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return reinterpret_cast<T *>(
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&const_cast<char &>(reinterpret_cast<char const volatile &>(v))
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);
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}
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/* pointer traits */
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namespace detail {
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template<typename T>
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struct HasElement {
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template<typename U>
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static int test(...);
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template<typename U>
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static char test(typename U::Element * = 0);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename T, bool = HasElement<T>::value>
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struct PointerElementBase;
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template<typename T>
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struct PointerElementBase<T, true> {
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using Type = typename T::Element;
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};
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template<template<typename, typename...> class T, typename U, typename ...A>
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struct PointerElementBase<T<U, A...>, true> {
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using Type = typename T<U, A...>::Element;
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};
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template<template<typename, typename...> class T, typename U, typename ...A>
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struct PointerElementBase<T<U, A...>, false> {
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using Type = U;
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};
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template<typename T>
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struct PointerElementType {
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using Type = typename PointerElementBase<T>::Type;
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};
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template<typename T>
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struct PointerElementType<T *> {
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using Type = T;
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};
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template<typename T>
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struct HasDifference {
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template<typename U>
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static int test(...);
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template<typename U>
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static char test(typename U::Difference * = 0);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename T, bool = HasDifference<T>::value>
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struct PointerDifferenceBase {
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using Type = ptrdiff_t;
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};
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template<typename T>
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struct PointerDifferenceBase<T, true> {
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using Type = typename T::Difference;
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};
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template<typename T>
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struct PointerDifferenceType {
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using Type = typename PointerDifferenceBase<T>::Type;
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};
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template<typename T>
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struct PointerDifferenceType<T *> {
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using Type = ptrdiff_t;
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};
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template<typename T, typename U>
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struct HasRebind {
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template<typename V>
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static int test(...);
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template<typename V>
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static char test(typename V::template Rebind<U> * = 0);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename T, typename U, bool = HasRebind<T, U>::value>
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struct PointerRebindBase {
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using Type = typename T::template Rebind<U>;
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};
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template<
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template<typename, typename...> class T, typename U,
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typename ...A, typename V
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>
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struct PointerRebindBase<T<U, A...>, V, true> {
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using Type = typename T<U, A...>::template Rebind<V>;
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};
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template<
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template<typename, typename...> class T, typename U,
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typename ...A, typename V
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>
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struct PointerRebindBase<T<U, A...>, V, false> {
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using Type = T<V, A...>;
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};
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template<typename T, typename U>
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struct PointerRebindType {
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using Type = typename PointerRebindBase<T, U>::Type;
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};
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template<typename T, typename U>
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struct PointerRebindType<T *, U> {
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using Type = U *;
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};
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template<typename T>
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struct PointerPointer {
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using Type = T;
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};
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template<typename T>
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struct PointerPointer<T *> {
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using Type = T *;
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};
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} /*namespace detail */
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template<typename T>
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using Pointer = typename detail::PointerPointer<T>::Type;
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template<typename T>
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using PointerElement = typename detail::PointerElementType<T>::Type;
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template<typename T>
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using PointerDifference = typename detail::PointerDifferenceType<T>::Type;
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template<typename T, typename U>
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using PointerRebind = typename detail::PointerRebindType<T, U>::Type;
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/* pointer to */
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namespace detail {
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struct PointerToNat {};
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template<typename T>
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struct PointerTo {
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static T pointer_to(
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Conditional<
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IsVoid<PointerElement<T>>, PointerToNat, PointerElement<T>
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> &r
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) {
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return T::pointer_to(r);
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}
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};
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template<typename T>
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struct PointerTo<T *> {
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static T pointer_to(Conditional<IsVoid<T>, PointerToNat, T> &r) {
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return address_of(r);
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}
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};
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}
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template<typename T>
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static T pointer_to(
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Conditional<
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IsVoid<PointerElement<T>>, detail::PointerToNat, PointerElement<T>
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> &r
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) {
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return detail::PointerTo<T>::pointer_to(r);
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}
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namespace detail {
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template<typename T>
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static int ptr_test(...);
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template<typename T>
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static char ptr_test(typename T::Pointer * = 0);
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template<typename T>
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constexpr bool HasPtr = sizeof(ptr_test<T>(0)) == 1;
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template<typename T, typename D, bool = HasPtr<D>>
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struct PointerBase {
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using Type = typename D::Pointer;
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};
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template<typename T, typename D>
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struct PointerBase<T, D, false> {
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using Type = T *;
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};
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template<typename T, typename D>
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struct PointerType {
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using Type = typename PointerBase<T, RemoveReference<D>>::Type;
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};
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} /* namespace detail */
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/* allocator */
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template<typename T>
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struct Allocator {
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using Value = T;
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Allocator() noexcept {}
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template<typename U>
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Allocator(Allocator<U> const &) noexcept {}
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Value *allocate(size_t n) {
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return reinterpret_cast<Value *>(::new byte[n * sizeof(T)]);
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}
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void deallocate(Value *p, size_t) noexcept {
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::delete[] reinterpret_cast<byte *>(p);
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}
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};
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template<typename T, typename U>
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bool operator==(Allocator<T> const &, Allocator<U> const &) noexcept {
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return true;
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}
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template<typename T, typename U>
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bool operator!=(Allocator<T> const &, Allocator<U> const &) noexcept {
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return false;
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}
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/* allocator traits - modeled after libc++ */
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namespace detail {
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template<typename T>
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struct ConstPtrTest {
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template<typename U>
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static char test(typename U::ConstPointer * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename T, typename P, typename A, bool = ConstPtrTest<A>::value>
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struct ConstPointer {
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using Type = typename A::ConstPointer;
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};
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template<typename T, typename P, typename A>
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struct ConstPointer<T, P, A, false> {
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using Type = PointerRebind<P, T const>;
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};
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template<typename T>
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struct VoidPtrTest {
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template<typename U>
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static char test(typename U::VoidPointer * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename P, typename A, bool = VoidPtrTest<A>::value>
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struct VoidPointer {
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using Type = typename A::VoidPointer;
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};
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template<typename P, typename A>
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struct VoidPointer<P, A, false> {
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using Type = PointerRebind<P, void>;
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};
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template<typename T>
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struct ConstVoidPtrTest {
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template<typename U> static char test(
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typename U::ConstVoidPointer * = 0);
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template<typename U> static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename P, typename A, bool = ConstVoidPtrTest<A>::value>
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struct ConstVoidPointer {
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using Type = typename A::ConstVoidPointer;
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};
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template<typename P, typename A>
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struct ConstVoidPointer<P, A, false> {
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using Type = PointerRebind<P, void const>;
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};
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template<typename T>
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struct SizeTest {
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template<typename U>
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static char test(typename U::Size * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename A, typename D, bool = SizeTest<A>::value>
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struct SizeBase {
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using Type = MakeUnsigned<D>;
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};
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template<typename A, typename D>
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struct SizeBase<A, D, true> {
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using Type = typename A::Size;
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};
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} /* namespace detail */
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/* allocator type traits */
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template<typename A>
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using AllocatorType = A;
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template<typename A>
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using AllocatorValue = typename AllocatorType<A>::Value;
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template<typename A>
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using AllocatorPointer = typename detail::PointerType<
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AllocatorValue<A>, AllocatorType<A>
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>::Type;
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template<typename A>
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using AllocatorConstPointer = typename detail::ConstPointer<
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AllocatorValue<A>, AllocatorPointer<A>, AllocatorType<A>
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>::Type;
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template<typename A>
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using AllocatorVoidPointer = typename detail::VoidPointer<
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AllocatorPointer<A>, AllocatorType<A>
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>::Type;
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template<typename A>
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using AllocatorConstVoidPointer = typename detail::ConstVoidPointer<
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AllocatorPointer<A>, AllocatorType<A>
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>::Type;
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/* allocator difference */
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namespace detail {
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template<typename T>
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struct DiffTest {
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template<typename U>
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static char test(typename U::Difference * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename A, typename P, bool = DiffTest<A>::value>
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struct AllocDifference {
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using Type = PointerDifference<P>;
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};
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template<typename A, typename P>
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struct AllocDifference<A, P, true> {
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using Type = typename A::Difference;
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};
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}
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template<typename A>
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using AllocatorDifference = typename detail::AllocDifference<
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A, AllocatorPointer<A>
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>::Type;
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/* allocator size */
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template<typename A>
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using AllocatorSize = typename detail::SizeBase<
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A, AllocatorDifference<A>
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>::Type;
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/* allocator rebind */
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namespace detail {
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template<typename T, typename U, bool = detail::HasRebind<T, U>::value>
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struct AllocTraitsRebindType {
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using Type = typename T::template Rebind<U>;
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};
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template<
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template<typename, typename...> class A, typename T,
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typename ...Args, typename U
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>
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struct AllocTraitsRebindType<A<T, Args...>, U, true> {
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using Type = typename A<T, Args...>::template Rebind<U>;
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};
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template<
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template<typename, typename...> class A, typename T,
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typename ...Args, typename U
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>
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struct AllocTraitsRebindType<A<T, Args...>, U, false> {
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using Type = A<U, Args...>;
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};
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} /* namespace detail */
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template<typename A, typename T>
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using AllocatorRebind = typename detail::AllocTraitsRebindType<
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AllocatorType<A>, T
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>::Type;
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/* allocator propagate on container copy assignment */
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namespace detail {
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template<typename T>
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struct PropagateOnContainerCopyAssignmentTest {
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template<typename U>
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static char test(decltype(U::PropagateOnContainerCopyAssignment) * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename A, bool =
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PropagateOnContainerCopyAssignmentTest<A>::value
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>
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constexpr bool PropagateOnContainerCopyAssignmentBase = false;
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template<typename A>
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constexpr bool PropagateOnContainerCopyAssignmentBase<A, true> =
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A::PropagateOnContainerCopyAssignment;
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} /* namespace detail */
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template<typename A>
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constexpr bool AllocatorPropagateOnContainerCopyAssignment =
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detail::PropagateOnContainerCopyAssignmentBase<A>;
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/* allocator propagate on container move assignment */
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namespace detail {
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template<typename T>
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struct PropagateOnContainerMoveAssignmentTest {
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template<typename U>
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static char test(decltype(U::PropagateOnContainerMoveAssignment) * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename A, bool =
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PropagateOnContainerMoveAssignmentTest<A>::value
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>
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constexpr bool PropagateOnContainerMoveAssignmentBase = false;
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template<typename A>
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constexpr bool PropagateOnContainerMoveAssignmentBase<A, true> =
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A::PropagateOnContainerMoveAssignment;
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} /* namespace detail */
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template<typename A>
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constexpr bool AllocatorPropagateOnContainerMoveAssignment =
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detail::PropagateOnContainerMoveAssignmentBase<A>;
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/* allocator propagate on container swap */
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namespace detail {
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template<typename T>
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struct PropagateOnContainerSwapTest {
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template<typename U>
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static char test(decltype(U::PropagateOnContainerSwap) * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename A, bool = PropagateOnContainerSwapTest<A>::value>
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constexpr bool PropagateOnContainerSwapBase = false;
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template<typename A>
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constexpr bool PropagateOnContainerSwapBase<A, true> =
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A::PropagateOnContainerSwap;
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} /* namespace detail */
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template<typename A>
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constexpr bool AllocatorPropagateOnContainerSwap =
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detail::PropagateOnContainerSwapBase<A>;
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/* allocator is always equal */
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namespace detail {
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template<typename T>
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struct IsAlwaysEqualTest {
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template<typename U>
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static char test(decltype(U::IsAlwaysEqual) * = 0);
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template<typename U>
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static int test(...);
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static constexpr bool value = (sizeof(test<T>(0)) == 1);
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};
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template<typename A, bool = IsAlwaysEqualTest<A>::value>
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constexpr bool IsAlwaysEqualBase = IsEmpty<A>;
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template<typename A>
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constexpr bool IsAlwaysEqualBase<A, true> = A::IsAlwaysEqual;
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} /* namespace detail */
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template<typename A>
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constexpr bool AllocatorIsAlwaysEqual = detail::IsAlwaysEqualBase<A>;
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/* allocator allocate */
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template<typename A>
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inline AllocatorPointer<A> allocator_allocate(A &a, AllocatorSize<A> n) {
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return a.allocate(n);
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}
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namespace detail {
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template<typename A, typename S, typename CVP>
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auto allocate_hint_test(A &&a, S &&sz, CVP &&p) ->
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decltype(a.allocate(sz, p), True());
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template<typename A, typename S, typename CVP>
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auto allocate_hint_test(A const &, S &&, CVP &&) -> False;
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template<typename A, typename S, typename CVP>
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constexpr bool AllocateHintTest =
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IsSame<
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decltype(allocate_hint_test(
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std::declval<A>(), std::declval<S>(), std::declval<CVP>()
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)), True
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>;
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template<typename A>
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inline AllocatorPointer<A> allocate(
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A &a, AllocatorSize<A> n, AllocatorConstVoidPointer<A> h, True
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) {
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return a.allocate(n, h);
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}
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template<typename A>
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inline AllocatorPointer<A> allocate(
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A &a, AllocatorSize<A> n, AllocatorConstVoidPointer<A>, False
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) {
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return a.allocate(n);
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}
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} /* namespace detail */
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template<typename A>
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inline AllocatorPointer<A> allocator_allocate(
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A &a, AllocatorSize<A> n, AllocatorConstVoidPointer<A> h
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) {
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return detail::allocate(
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a, n, h, BoolConstant<detail::AllocateHintTest<
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A, AllocatorSize<A>, AllocatorConstVoidPointer<A>
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>>()
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);
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}
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/* allocator deallocate */
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template<typename A>
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inline void allocator_deallocate(
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A &a, AllocatorPointer<A> p, AllocatorSize<A> n
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) noexcept {
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a.deallocate(p, n);
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}
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|
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/* allocator construct */
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namespace detail {
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template<typename A, typename T, typename ...Args>
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auto construct_test(A &&a, T *p, Args &&...args) ->
|
|
decltype(a.construct(p, std::forward<Args>(args)...), True());
|
|
|
|
template<typename A, typename T, typename ...Args>
|
|
auto construct_test(A const &, T *, Args &&...) -> False;
|
|
|
|
template<typename A, typename T, typename ...Args>
|
|
constexpr bool ConstructTest =
|
|
IsSame<
|
|
decltype(construct_test(
|
|
std::declval<A>(), std::declval<T>(), std::declval<Args>()...
|
|
)), True
|
|
>;
|
|
|
|
template<typename A, typename T, typename ...Args>
|
|
inline void construct(True, A &a, T *p, Args &&...args) {
|
|
a.construct(p, std::forward<Args>(args)...);
|
|
}
|
|
|
|
template<typename A, typename T, typename ...Args>
|
|
inline void construct(False, A &, T *p, Args &&...args) {
|
|
::new (p) T(std::forward<Args>(args)...);
|
|
}
|
|
} /* namespace detail */
|
|
|
|
template<typename A, typename T, typename ...Args>
|
|
inline void allocator_construct(A &a, T *p, Args &&...args) {
|
|
detail::construct(
|
|
BoolConstant<detail::ConstructTest<A, T *, Args...>>(),
|
|
a, p, std::forward<Args>(args)...
|
|
);
|
|
}
|
|
|
|
/* allocator destroy */
|
|
|
|
namespace detail {
|
|
template<typename A, typename P>
|
|
auto destroy_test(A &&a, P &&p) -> decltype(a.destroy(p), True());
|
|
|
|
template<typename A, typename P>
|
|
auto destroy_test(A const &, P &&) -> False;
|
|
|
|
template<typename A, typename P>
|
|
constexpr bool DestroyTest = IsSame<
|
|
decltype(destroy_test(std::declval<A>(), std::declval<P>())), True
|
|
>;
|
|
|
|
template<typename A, typename T>
|
|
inline void destroy(True, A &a, T *p) {
|
|
a.destroy(p);
|
|
}
|
|
|
|
template<typename A, typename T>
|
|
inline void destroy(False, A &, T *p) {
|
|
p->~T();
|
|
}
|
|
} /* namespace detail */
|
|
|
|
template<typename A, typename T>
|
|
inline void allocator_destroy(A &a, T *p) noexcept {
|
|
detail::destroy(BoolConstant<detail::DestroyTest<A, T *>>(), a, p);
|
|
}
|
|
|
|
/* allocator max size */
|
|
|
|
namespace detail {
|
|
template<typename A>
|
|
auto alloc_max_size_test(A &&a) -> decltype(a.max_size(), True());
|
|
|
|
template<typename A>
|
|
auto alloc_max_size_test(A const &) -> False;
|
|
|
|
template<typename A>
|
|
constexpr bool AllocMaxSizeTest =
|
|
IsSame<decltype(alloc_max_size_test(std::declval<A &>())), True>;
|
|
|
|
template<typename A>
|
|
inline AllocatorSize<A> alloc_max_size(True, A const &a) {
|
|
return a.max_size();
|
|
}
|
|
|
|
template<typename A>
|
|
inline AllocatorSize<A> alloc_max_size(False, A const &) {
|
|
return AllocatorSize<A>(~0);
|
|
}
|
|
} /* namespace detail */
|
|
|
|
template<typename A>
|
|
inline AllocatorSize<A> allocator_max_size(A const &a) noexcept {
|
|
return detail::alloc_max_size(
|
|
BoolConstant<detail::AllocMaxSizeTest<A const>>(), a
|
|
);
|
|
}
|
|
|
|
/* allocator container copy */
|
|
|
|
namespace detail {
|
|
template<typename A>
|
|
auto alloc_copy_test(A &&a) -> decltype(a.container_copy(), True());
|
|
|
|
template<typename A>
|
|
auto alloc_copy_test(A const &) -> False;
|
|
|
|
template<typename A>
|
|
constexpr bool AllocCopyTest =
|
|
IsSame<decltype(alloc_copy_test(std::declval<A &>())), True>;
|
|
|
|
template<typename A>
|
|
inline AllocatorType<A> alloc_container_copy(True, A const &a) {
|
|
return a.container_copy();
|
|
}
|
|
|
|
template<typename A>
|
|
inline AllocatorType<A> alloc_container_copy(False, A const &a) {
|
|
return a;
|
|
}
|
|
} /* namespace detail */
|
|
|
|
template<typename A>
|
|
inline AllocatorType<A> allocator_container_copy(A const &a) {
|
|
return detail::alloc_container_copy(
|
|
BoolConstant<detail::AllocCopyTest<A const>>(), a
|
|
);
|
|
}
|
|
|
|
/* allocator arg */
|
|
|
|
struct AllocatorArg {};
|
|
|
|
constexpr AllocatorArg allocator_arg = AllocatorArg();
|
|
|
|
/* uses allocator */
|
|
|
|
namespace detail {
|
|
template<typename T>
|
|
struct HasAllocatorType {
|
|
template<typename U>
|
|
static char test(typename U::Allocator *);
|
|
template<typename U>
|
|
static int test(...);
|
|
static constexpr bool value = (sizeof(test<T>(0)) == 1);
|
|
};
|
|
|
|
template<typename T, typename A, bool = HasAllocatorType<T>::value>
|
|
constexpr bool UsesAllocatorBase = IsConvertible<A, typename T::Allocator>;
|
|
|
|
template<typename T, typename A>
|
|
constexpr bool UsesAllocatorBase<T, A, false> = false;
|
|
}
|
|
|
|
template<typename T, typename A>
|
|
constexpr bool UsesAllocator = detail::UsesAllocatorBase<T, A>;
|
|
|
|
/* uses allocator ctor */
|
|
|
|
namespace detail {
|
|
template<typename T, typename A, typename ...Args>
|
|
struct UsesAllocCtor {
|
|
static constexpr bool ua = UsesAllocator<T, A>;
|
|
static constexpr bool ic = IsConstructible<
|
|
T, AllocatorArg, A, Args...
|
|
>;
|
|
static constexpr int value = ua ? (2 - ic) : 0;
|
|
};
|
|
}
|
|
|
|
template<typename T, typename A, typename ...Args>
|
|
constexpr int UsesAllocatorConstructor =
|
|
detail::UsesAllocCtor<T, A, Args...>::value;
|
|
|
|
/* util for other classes */
|
|
|
|
namespace detail {
|
|
template<typename A>
|
|
struct AllocatorDestructor {
|
|
using Pointer = AllocatorPointer<A>;
|
|
using Size = size_t;
|
|
AllocatorDestructor(A &a, Size s) noexcept: p_alloc(a), p_size(s) {}
|
|
void operator()(Pointer p) noexcept {
|
|
allocator_deallocate(p_alloc, p, p_size);
|
|
}
|
|
private:
|
|
A &p_alloc;
|
|
Size p_size;
|
|
};
|
|
}
|
|
|
|
} /* namespace ostd */
|
|
|
|
#endif
|