forked from OctaForge/libostd
for MapRange, specialize stored func in a few ways to avoid octa::Function (and thus avoid the significant overhead it brings)
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2652fe9242
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36d9a35066
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@ -412,17 +412,81 @@ T foldr(R range, T init, F func) {
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return init;
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}
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template<typename T, typename R>
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namespace detail {
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template<typename F>
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struct MapLambdaArgs: MapLambdaArgs<decltype(&F::operator())> {};
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template<typename C, typename R, typename A>
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struct MapLambdaArgs<R(C::*)(A) const> {
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typedef R Result;
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typedef A Arg;
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};
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template<typename F>
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using MapLambdaRet = typename MapLambdaArgs<F>::Result;
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template<typename F>
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using MapLambdaArg = typename MapLambdaArgs<F>::Arg;
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template<typename T, typename F>
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struct MapFuncTest {
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template<typename FF>
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static char test(MapLambdaRet<FF> (*)(MapLambdaArg<FF>));
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template<typename FF>
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static int test(...);
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static constexpr bool value = (sizeof(test<F>(octa::declval<F>())) == 1) &&
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octa::IsConvertible<
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octa::RangeReference<T>,
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decltype(octa::declval<F>()(octa::declval<
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octa::RangeReference<T>
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>()))
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>::value;
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};
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template<typename T, typename R, typename F,
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bool = octa::IsDefaultConstructible<F>::value &&
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octa::IsMoveConstructible<F>::value
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> struct MapFuncTypeObjBase {
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typedef octa::Function<R(octa::RangeReference<T>)> Type;
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};
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template<typename T, typename R, typename F>
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struct MapFuncTypeObjBase<T, R, F, true> {
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typedef F Type;
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};
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template<typename T, typename R, typename F, bool = MapFuncTest<T, F>::value>
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struct MapFuncTypeObj {
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typedef typename MapFuncTypeObjBase<T, R, F>::Type Type;
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};
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template<typename T, typename R, typename F>
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struct MapFuncTypeObj<T, R, F, true> {
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typedef MapLambdaRet<F>(*Type)(MapLambdaArg<F>);
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};
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template<typename T, typename R, typename F, bool = octa::IsClass<F>::value>
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struct MapFuncType {
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typedef typename MapFuncTypeObj<T, R, F>::Type Type;
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};
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template<typename T, typename R, typename F>
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struct MapFuncType<T, R, F, false> {
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typedef F Type;
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};
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}
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template<typename T, typename F, typename R>
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struct MapRange: InputRange<
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MapRange<T, R>, octa::RangeCategory<T>, R, R, octa::RangeSize<T>
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MapRange<T, F, R>, octa::RangeCategory<T>, R, R, octa::RangeSize<T>
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> {
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private:
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T p_range;
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octa::Function<R(octa::RangeReference<T>)> p_func;
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typename octa::detail::MapFuncType<T, R, F>::Type p_func;
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public:
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MapRange(): p_range(), p_func() {}
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template<typename F>
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MapRange(const T &range, const F &func):
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p_range(range), p_func(func) {}
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MapRange(const MapRange &it):
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@ -485,9 +549,9 @@ public:
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return p_func(p_range[idx]);
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}
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MapRange<T, R> slice(octa::RangeSize<T> start,
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MapRange slice(octa::RangeSize<T> start,
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octa::RangeSize<T> end) {
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return MapRange<T, R>(p_range.slice(start, end), p_func);
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return MapRange(p_range.slice(start, end), p_func);
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}
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};
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@ -496,17 +560,18 @@ namespace detail {
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= decltype(declval<F>()(octa::declval<octa::RangeReference<R>>()));
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}
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template<typename R, typename F>
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MapRange<R, octa::detail::MapReturnType<R, F>> map(R range,
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MapRange<R, F, octa::detail::MapReturnType<R, F>> map(R range,
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F func) {
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return octa::MapRange<R, octa::detail::MapReturnType<R, F>>(range,
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return octa::MapRange<R, F, octa::detail::MapReturnType<R, F>>(range,
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func);
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}
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template<typename T>
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struct FilterRange: InputRange<
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FilterRange<T>, octa::CommonType<octa::RangeCategory<T>,
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octa::ForwardRangeTag>,
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octa::ForwardRangeTag>,
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octa::RangeValue<T>, octa::RangeReference<T>, octa::RangeSize<T>
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> {
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private:
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@ -135,7 +135,7 @@ template<typename T, size_t N> struct IsArray<T[N]>: True {};
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/* is pointer */
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namespace detail {
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template<typename > struct IsPointerBase : False {};
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template<typename > struct IsPointerBase : False {};
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template<typename T> struct IsPointerBase<T *>: True {};
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}
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@ -144,12 +144,12 @@ struct IsPointer: octa::detail::IsPointerBase<RemoveCv<T>> {};
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/* is lvalue reference */
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template<typename > struct IsLvalueReference : False {};
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template<typename > struct IsLvalueReference : False {};
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template<typename T> struct IsLvalueReference<T &>: True {};
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/* is rvalue reference */
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template<typename > struct IsRvalueReference : False {};
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template<typename > struct IsRvalueReference : False {};
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template<typename T> struct IsRvalueReference<T &&>: True {};
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/* is enum */
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@ -174,13 +174,13 @@ namespace detail {
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template<typename T> int function_test(...);
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template<typename T> T &function_source(int);
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template<typename T> FunctionTestDummy function_source(...);
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template<typename T> FunctionTestDummy function_source(...);
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template<typename T, bool = octa::IsClass<T>::value ||
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octa::IsUnion<T>::value ||
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octa::IsVoid<T>::value ||
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octa::IsReference<T>::value ||
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octa::IsNullPointer<T>::value
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octa::IsUnion<T>::value ||
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octa::IsVoid<T>::value ||
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octa::IsReference<T>::value ||
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octa::IsNullPointer<T>::value
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> struct IsFunctionBase: IntegralConstant<bool,
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sizeof(function_test<T>(function_source<T>(0))) == 1
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> {};
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