forked from OctaForge/libostd
656 lines
18 KiB
C++
656 lines
18 KiB
C++
/* Function objects 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 OCTA_FUNCTIONAL_H
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#define OCTA_FUNCTIONAL_H
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#include "octa/new.h"
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#include "octa/memory.h"
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#include "octa/utility.h"
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#include "octa/type_traits.h"
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namespace octa {
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/* basic function objects */
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#define OCTA_DEFINE_BINARY_OP(_name, _op, _rettype) \
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template<typename _T> struct _name { \
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_rettype operator()(const _T &x, const _T &y) const { \
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return x _op y; \
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} \
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typedef _T FirstArgument; \
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typedef _T SecondArgument; \
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typedef _rettype Result; \
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};
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OCTA_DEFINE_BINARY_OP(Less, <, bool)
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OCTA_DEFINE_BINARY_OP(LessEqual, <=, bool)
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OCTA_DEFINE_BINARY_OP(Greater, >, bool)
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OCTA_DEFINE_BINARY_OP(GreaterEqual, >=, bool)
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OCTA_DEFINE_BINARY_OP(Equal, ==, bool)
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OCTA_DEFINE_BINARY_OP(NotEqual, !=, bool)
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OCTA_DEFINE_BINARY_OP(LogicalAnd, &&, bool)
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OCTA_DEFINE_BINARY_OP(LogicalOr, ||, bool)
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OCTA_DEFINE_BINARY_OP(Modulus, %, _T)
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OCTA_DEFINE_BINARY_OP(Multiplies, *, _T)
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OCTA_DEFINE_BINARY_OP(Divides, /, _T)
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OCTA_DEFINE_BINARY_OP(Plus, +, _T)
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OCTA_DEFINE_BINARY_OP(Minus, -, _T)
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OCTA_DEFINE_BINARY_OP(BitAnd, &, _T)
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OCTA_DEFINE_BINARY_OP(BitOr, |, _T)
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OCTA_DEFINE_BINARY_OP(BitXor, ^, _T)
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#undef OCTA_DEFINE_BINARY_OP
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template<typename _T> struct LogicalNot {
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bool operator()(const _T &x) const { return !x; }
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typedef _T Argument;
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typedef bool Result;
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};
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template<typename _T> struct Negate {
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bool operator()(const _T &x) const { return -x; }
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typedef _T Argument;
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typedef _T Result;
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};
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template<typename _T> struct BinaryNegate {
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typedef typename _T::FirstArgument FirstArgument;
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typedef typename _T::SecondArgument SecondArgument;
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typedef bool Result;
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explicit BinaryNegate(const _T &f): p_fn(f) {}
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bool operator()(const FirstArgument &x,
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const SecondArgument &y) {
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return !p_fn(x, y);
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}
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private:
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_T p_fn;
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};
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template<typename _T> struct UnaryNegate {
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typedef typename _T::Argument Argument;
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typedef bool Result;
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explicit UnaryNegate(const _T &f): p_fn(f) {}
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bool operator()(const Argument &x) {
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return !p_fn(x);
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}
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private:
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_T p_fn;
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};
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template<typename _T> UnaryNegate<_T> not1(const _T &fn) {
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return UnaryNegate<_T>(fn);
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}
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template<typename _T> BinaryNegate<_T> not2(const _T &fn) {
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return BinaryNegate<_T>(fn);
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}
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/* hash */
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template<typename _T> struct Hash;
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namespace detail {
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template<typename _T> struct HashBase {
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typedef _T Argument;
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typedef size_t Result;
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size_t operator()(_T v) const {
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return size_t(v);
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}
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};
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}
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#define OCTA_HASH_BASIC(_T) template<> struct Hash<_T>: octa::detail::HashBase<_T> {};
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OCTA_HASH_BASIC(bool)
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OCTA_HASH_BASIC(char)
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OCTA_HASH_BASIC(schar)
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OCTA_HASH_BASIC(uchar)
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OCTA_HASH_BASIC(char16_t)
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OCTA_HASH_BASIC(char32_t)
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OCTA_HASH_BASIC(wchar_t)
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OCTA_HASH_BASIC(short)
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OCTA_HASH_BASIC(ushort)
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OCTA_HASH_BASIC(int)
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OCTA_HASH_BASIC(uint)
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OCTA_HASH_BASIC(long)
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OCTA_HASH_BASIC(ulong)
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#undef OCTA_HASH_BASIC
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namespace detail {
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static inline size_t mem_hash(const void *p, size_t l) {
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const uchar *d = (const uchar *)p;
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size_t h = 5381;
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for (size_t i = 0; i < l; ++i) h = ((h << 5) + h) ^ d[i];
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return h;
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}
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template<typename _T, size_t = sizeof(_T) / sizeof(size_t)>
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struct ScalarHash;
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template<typename _T> struct ScalarHash<_T, 0> {
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typedef _T Argument;
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typedef size_t Result;
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size_t operator()(_T v) const {
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union { _T v; size_t h; } u;
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u.h = 0;
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u.v = v;
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return u.h;
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}
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};
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template<typename _T> struct ScalarHash<_T, 1> {
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typedef _T Argument;
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typedef size_t Result;
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size_t operator()(_T v) const {
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union { _T v; size_t h; } u;
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u.v = v;
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return u.h;
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}
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};
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template<typename _T> struct ScalarHash<_T, 2> {
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typedef _T Argument;
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typedef size_t Result;
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size_t operator()(_T v) const {
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union { _T v; struct { size_t h1, h2; }; } u;
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u.v = v;
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return mem_hash((const void *)&u, sizeof(u));
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}
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};
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template<typename _T> struct ScalarHash<_T, 3> {
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typedef _T Argument;
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typedef size_t Result;
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size_t operator()(_T v) const {
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union { _T v; struct { size_t h1, h2, h3; }; } u;
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u.v = v;
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return mem_hash((const void *)&u, sizeof(u));
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}
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};
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template<typename _T> struct ScalarHash<_T, 4> {
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typedef _T Argument;
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typedef size_t Result;
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size_t operator()(_T v) const {
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union { _T v; struct { size_t h1, h2, h3, h4; }; } u;
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u.v = v;
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return mem_hash((const void *)&u, sizeof(u));
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}
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};
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} /* namespace detail */
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template<> struct Hash<llong>: octa::detail::ScalarHash<llong> {};
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template<> struct Hash<ullong>: octa::detail::ScalarHash<ullong> {};
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template<> struct Hash<float>: octa::detail::ScalarHash<float> {
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size_t operator()(float v) const {
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if (v == 0) return 0;
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return octa::detail::ScalarHash<float>::operator()(v);
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}
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};
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template<> struct Hash<double>: octa::detail::ScalarHash<double> {
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size_t operator()(double v) const {
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if (v == 0) return 0;
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return octa::detail::ScalarHash<double>::operator()(v);
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}
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};
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template<> struct Hash<ldouble>: octa::detail::ScalarHash<ldouble> {
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size_t operator()(ldouble v) const {
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if (v == 0) return 0;
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#ifdef __i386__
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union { ldouble v; struct { size_t h1, h2, h3, h4; }; } u;
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u.h1 = u.h2 = u.h3 = u.h4 = 0;
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u.v = v;
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return (u.h1 ^ u.h2 ^ u.h3 ^ u.h4);
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#else
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#ifdef __x86_64__
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union { ldouble v; struct { size_t h1, h2; }; } u;
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u.h1 = u.h2 = 0;
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u.v = v;
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return (u.h1 ^ u.h2);
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#else
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return octa::detail::ScalarHash<ldouble>::operator()(v);
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#endif
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#endif
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}
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};
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template<typename _T> struct Hash<_T *> {
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typedef _T *Argument;
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typedef size_t Result;
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size_t operator()(_T *v) const {
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union { _T *v; size_t h; } u;
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u.v = v;
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return octa::detail::mem_hash((const void *)&u, sizeof(u));
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}
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};
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/* reference wrapper */
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template<typename _T>
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struct ReferenceWrapper {
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typedef _T type;
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ReferenceWrapper(_T &v): p_ptr(address_of(v)) {}
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ReferenceWrapper(const ReferenceWrapper &) = default;
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ReferenceWrapper(_T &&) = delete;
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ReferenceWrapper &operator=(const ReferenceWrapper &) = default;
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operator _T &() const { return *p_ptr; }
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_T &get() const { return *p_ptr; }
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private:
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_T *p_ptr;
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};
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template<typename _T>
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ReferenceWrapper<_T> ref(_T &v) {
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return ReferenceWrapper<_T>(v);
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}
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template<typename _T>
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ReferenceWrapper<_T> ref(ReferenceWrapper<_T> v) {
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return ReferenceWrapper<_T>(v);
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}
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template<typename _T> void ref(const _T &&) = delete;
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template<typename _T>
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ReferenceWrapper<const _T> cref(const _T &v) {
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return ReferenceWrapper<_T>(v);
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}
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template<typename _T>
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ReferenceWrapper<const _T> cref(ReferenceWrapper<_T> v) {
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return ReferenceWrapper<_T>(v);
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}
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template<typename _T> void cref(const _T &&) = delete;
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/* mem_fn */
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namespace detail {
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template<typename, typename> struct MemTypes;
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template<typename _T, typename _R, typename ..._A>
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struct MemTypes<_T, _R(_A...)> {
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typedef _R Result;
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typedef _T Argument;
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};
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template<typename _T, typename _R, typename _A>
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struct MemTypes<_T, _R(_A)> {
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typedef _R Result;
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typedef _T FirstArgument;
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typedef _A SecondArgument;
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};
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template<typename _T, typename _R, typename ..._A>
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struct MemTypes<_T, _R(_A...) const> {
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typedef _R Result;
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typedef const _T Argument;
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};
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template<typename _T, typename _R, typename _A>
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struct MemTypes<_T, _R(_A) const> {
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typedef _R Result;
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typedef const _T FirstArgument;
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typedef _A SecondArgument;
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};
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template<typename _R, typename _T>
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class MemFn: MemTypes<_T, _R> {
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_R _T::*p_ptr;
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public:
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MemFn(_R _T::*ptr): p_ptr(ptr) {}
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template<typename... _A>
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auto operator()(_T &obj, _A &&...args) ->
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decltype(((obj).*(p_ptr))(forward<_A>(args)...)) {
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return ((obj).*(p_ptr))(forward<_A>(args)...);
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}
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template<typename... _A>
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auto operator()(const _T &obj, _A &&...args) ->
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decltype(((obj).*(p_ptr))(forward<_A>(args)...)) const {
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return ((obj).*(p_ptr))(forward<_A>(args)...);
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}
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template<typename... _A>
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auto operator()(_T *obj, _A &&...args) ->
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decltype(((obj)->*(p_ptr))(forward<_A>(args)...)) {
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return ((obj)->*(p_ptr))(forward<_A>(args)...);
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}
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template<typename... _A>
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auto operator()(const _T *obj, _A &&...args) ->
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decltype(((obj)->*(p_ptr))(forward<_A>(args)...)) const {
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return ((obj)->*(p_ptr))(forward<_A>(args)...);
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}
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};
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} /* namespace detail */
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template<typename _R, typename _T>
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octa::detail::MemFn<_R, _T> mem_fn(_R _T:: *ptr) {
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return octa::detail::MemFn<_R, _T>(ptr);
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}
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/* function impl
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* reference: http://probablydance.com/2013/01/13/a-faster-implementation-of-stdfunction
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*/
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template<typename> struct Function;
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namespace detail {
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struct FunctorData {
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void *p1, *p2;
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};
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template<typename _T>
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struct FunctorInPlace {
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static constexpr bool value = sizeof(_T) <= sizeof(FunctorData)
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&& (alignof(FunctorData) % alignof(_T)) == 0
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&& octa::IsMoveConstructible<_T>::value;
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};
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template<typename _T, typename _E = void>
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struct FunctorDataManager {
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template<typename _R, typename ..._A>
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static _R call(const FunctorData &s, _A ...args) {
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return ((_T &)s)(octa::forward<_A>(args)...);
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}
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static void store_f(FunctorData &s, _T v) {
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new (&get_ref(s)) _T(octa::forward<_T>(v));
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}
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static void move_f(FunctorData &lhs, FunctorData &&rhs) {
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new (&get_ref(lhs)) _T(octa::move(get_ref(rhs)));
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}
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static void destroy_f(FunctorData &s) {
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get_ref(s).~_T();
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}
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static _T &get_ref(const FunctorData &s) {
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return (_T &)s;
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}
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};
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template<typename _T>
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struct FunctorDataManager<_T,
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EnableIf<!FunctorInPlace<_T>::value>
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> {
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template<typename _R, typename ..._A>
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static _R call(const FunctorData &s, _A ...args) {
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return (*(_T *&)s)(octa::forward<_A>(args)...);
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}
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static void store_f(FunctorData &s, _T v) {
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new (&get_ptr_ref(s)) _T *(new _T(octa::forward<_T>(v)));
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}
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static void move_f(FunctorData &lhs, FunctorData &&rhs) {
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new (&get_ptr_ref(lhs)) _T *(get_ptr_ref(rhs));
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get_ptr_ref(rhs) = nullptr;
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}
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static void destroy_f(FunctorData &s) {
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_T *&ptr = get_ptr_ref(s);
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if (!ptr) return;
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delete ptr;
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ptr = nullptr;
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}
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static _T &get_ref(const FunctorData &s) {
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return *get_ptr_ref(s);
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}
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static _T *&get_ptr_ref(FunctorData &s) {
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return (_T *&)s;
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}
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static _T *&get_ptr_ref(const FunctorData &s) {
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return (_T *&)s;
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}
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};
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struct FunctionManager;
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struct FmStorage {
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FunctorData data;
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const FunctionManager *manager;
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};
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template<typename _T>
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static const FunctionManager &get_default_fm();
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struct FunctionManager {
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template<typename _T>
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inline static const FunctionManager create_default_manager() {
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return FunctionManager {
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&call_move_and_destroy<_T>,
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&call_copy<_T>,
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&call_destroy<_T>
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};
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}
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void (* const call_move_and_destroyf)(FmStorage &lhs,
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FmStorage &&rhs);
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void (* const call_copyf)(FmStorage &lhs,
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const FmStorage &rhs);
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void (* const call_destroyf)(FmStorage &s);
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template<typename _T>
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static void call_move_and_destroy(FmStorage &lhs,
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FmStorage &&rhs) {
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typedef FunctorDataManager<_T> _spec;
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_spec::move_f(lhs.data, octa::move(rhs.data));
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_spec::destroy_f(rhs.data);
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lhs.manager = &get_default_fm<_T>();
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}
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template<typename _T>
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static void call_copy(FmStorage &lhs,
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const FmStorage &rhs) {
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typedef FunctorDataManager<_T> _spec;
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lhs.manager = &get_default_fm<_T>();
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_spec::store_f(lhs.data, _spec::get_ref(rhs.data));
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}
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template<typename _T>
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static void call_destroy(FmStorage &s) {
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typedef FunctorDataManager<_T> _spec;
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_spec::destroy_f(s.data);
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}
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};
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template<typename _T>
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inline static const FunctionManager &get_default_fm() {
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static const FunctionManager def_manager
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= FunctionManager::create_default_manager<_T>();
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return def_manager;
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}
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template<typename _R, typename...>
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struct FunctionBase {
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typedef _R Result;
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};
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template<typename _R, typename _T>
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struct FunctionBase<_R, _T> {
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typedef _R Result;
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typedef _T Argument;
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};
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template<typename _R, typename _T, typename _U>
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struct FunctionBase<_R, _T, _U> {
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typedef _R Result;
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typedef _T FirstArgument;
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typedef _U SecondArgument;
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};
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template<typename, typename>
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struct IsValidFunctor {
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static constexpr bool value = false;
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};
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template<typename _R, typename ..._A>
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struct IsValidFunctor<Function<_R(_A...)>, _R(_A...)> {
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static constexpr bool value = false;
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};
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struct Empty {
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};
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template<typename _T>
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_T func_to_functor(_T &&f) {
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return octa::forward<_T>(f);
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}
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template<typename _RR, typename _T, typename ..._AA>
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auto func_to_functor(_RR (_T::*f)(_AA...))
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-> decltype(mem_fn(f)) {
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return mem_fn(f);
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}
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template<typename _RR, typename _T, typename ..._AA>
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auto func_to_functor(_RR (_T::*f)(_AA...) const)
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-> decltype(mem_fn(f)) {
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return mem_fn(f);
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}
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template<typename _T, typename _R, typename ..._A>
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|
struct IsValidFunctor<_T, _R(_A...)> {
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|
template<typename _U>
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|
static decltype(func_to_functor(octa::declval<_U>())
|
|
(octa::declval<_A>()...)) test(_U *);
|
|
template<typename>
|
|
static Empty test(...);
|
|
|
|
static constexpr bool value = octa::IsConvertible<
|
|
decltype(test<_T>(nullptr)), _R
|
|
>::value;
|
|
};
|
|
} /* namespace detail */
|
|
|
|
template<typename _R, typename ..._A>
|
|
struct Function<_R(_A...)>: octa::detail::FunctionBase<_R, _A...> {
|
|
Function( ) { init_empty(); }
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|
Function(nullptr_t) { init_empty(); }
|
|
|
|
Function(Function &&f) {
|
|
init_empty();
|
|
swap(f);
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|
}
|
|
|
|
Function(const Function &f): p_call(f.p_call) {
|
|
f.p_stor.manager->call_copyf(p_stor, f.p_stor);
|
|
}
|
|
|
|
template<typename _T>
|
|
Function(_T f, EnableIf<
|
|
octa::detail::IsValidFunctor<_T, _R(_A...)>::value,
|
|
octa::detail::Empty
|
|
> = octa::detail::Empty()) {
|
|
if (func_is_null(f)) {
|
|
init_empty();
|
|
return;
|
|
}
|
|
initialize(octa::detail::func_to_functor(octa::forward<_T>(f)));
|
|
}
|
|
|
|
~Function() {
|
|
p_stor.manager->call_destroyf(p_stor);
|
|
}
|
|
|
|
Function &operator=(Function &&f) {
|
|
p_stor.manager->call_destroyf(p_stor);
|
|
swap(f);
|
|
return *this;
|
|
}
|
|
|
|
Function &operator=(const Function &f) {
|
|
p_stor.manager->call_destroyf(p_stor);
|
|
f.p_stor.manager->call_copyf(p_stor, f.p_stor);
|
|
return *this;
|
|
};
|
|
|
|
_R operator()(_A ...args) const {
|
|
return p_call(p_stor.data, octa::forward<_A>(args)...);
|
|
}
|
|
|
|
template<typename _F> void assign(_F &&f) {
|
|
Function(octa::forward<_F>(f)).swap(*this);
|
|
}
|
|
|
|
void swap(Function &f) {
|
|
octa::detail::FmStorage tmp;
|
|
f.p_stor.manager->call_move_and_destroyf(tmp,
|
|
octa::move(f.p_stor));
|
|
p_stor.manager->call_move_and_destroyf(f.p_stor,
|
|
octa::move(p_stor));
|
|
tmp.manager->call_move_and_destroyf(p_stor,
|
|
octa::move(tmp));
|
|
octa::swap(p_call, f.p_call);
|
|
}
|
|
|
|
operator bool() const { return p_call != nullptr; }
|
|
|
|
private:
|
|
octa::detail::FmStorage p_stor;
|
|
_R (*p_call)(const octa::detail::FunctorData &, _A...);
|
|
|
|
template<typename _T>
|
|
void initialize(_T f) {
|
|
p_call = &octa::detail::FunctorDataManager<_T>::template call<_R, _A...>;
|
|
p_stor.manager = &octa::detail::get_default_fm<_T>();
|
|
octa::detail::FunctorDataManager<_T>::store_f(p_stor.data,
|
|
octa::forward<_T>(f));
|
|
}
|
|
|
|
void init_empty() {
|
|
typedef _R(*emptyf)(_A...);
|
|
p_call = nullptr;
|
|
p_stor.manager = &octa::detail::get_default_fm<emptyf>();
|
|
octa::detail::FunctorDataManager<emptyf>::store_f(p_stor.data, nullptr);
|
|
}
|
|
|
|
template<typename _T>
|
|
static bool func_is_null(const _T &) { return false; }
|
|
|
|
static bool func_is_null(_R (* const &fptr)(_A...)) {
|
|
return fptr == nullptr;
|
|
}
|
|
|
|
template<typename _RR, typename _T, typename ..._AA>
|
|
static bool func_is_null(_RR (_T::* const &fptr)(_AA...)) {
|
|
return fptr == nullptr;
|
|
}
|
|
|
|
template<typename _RR, typename _T, typename ..._AA>
|
|
static bool func_is_null(_RR (_T::* const &fptr)(_AA...) const) {
|
|
return fptr == nullptr;
|
|
}
|
|
};
|
|
|
|
template<typename _T>
|
|
bool operator==(nullptr_t, const Function<_T> &rhs) { return !rhs; }
|
|
|
|
template<typename _T>
|
|
bool operator==(const Function<_T> &lhs, nullptr_t) { return !lhs; }
|
|
|
|
template<typename _T>
|
|
bool operator!=(nullptr_t, const Function<_T> &rhs) { return rhs; }
|
|
|
|
template<typename _T>
|
|
bool operator!=(const Function<_T> &lhs, nullptr_t) { return lhs; }
|
|
|
|
} /* namespace octa */
|
|
|
|
#endif |