194 lines
7.1 KiB
C++
194 lines
7.1 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_TRAITS_HPP
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#define REXY_TRAITS_HPP
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#include <type_traits> //is_same, decay, integral_constant, declval
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#include <iterator> //iterator_traits
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#include "rexy.hpp"
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namespace rexy{
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template<class T, class U>
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struct is_type{
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static std::true_type check(U*);
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static std::false_type check(...);
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static constexpr bool value = decltype(check(std::declval<std::decay_t<T>*>()))::value;
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};
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template<class T, template<class...> class U>
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struct is_template_type_helper{
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static constexpr bool value = false;
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};
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template<template<class...> class U, class... Args>
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struct is_template_type_helper<U<Args...>,U>{
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static constexpr bool value = true;
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};
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template<class T, template<class...> class U>
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struct is_template_type : public is_template_type_helper<std::decay_t<T>,U>{};
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template<class T, template<class...> class Tmpl>
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struct is_template_derived_type{
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template<class... Args>
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static std::true_type test(Tmpl<Args...>*);
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static std::false_type test(void*);
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static constexpr bool value = std::is_same<std::true_type,decltype(test(static_cast<std::decay_t<T>*>(nullptr)))>::value;
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};
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#ifdef REXY_STANDARD_CPP20
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template<class T>
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struct remove_cvref : public std::remove_cvref<T>{};
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template<class T>
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using remove_cvref_t = typename remove_cvref<T>::type;
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#else // REXY_STANDARD_CPP26
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template<class T>
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struct remove_volatile{
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using type = T;
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};
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template<class T>
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struct remove_volatile<volatile T>{
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using type = T;
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};
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template<class T>
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using remove_volatile_t = typename remove_volatile<T>::type;
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template<class T>
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struct remove_const{
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using type = T;
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};
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template<class T>
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struct remove_const<const T>{
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using type = T;
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};
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template<class T>
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using remove_const_t = typename remove_const<T>::type;
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template<class T>
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struct remove_cv{
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using type = remove_volatile_t<remove_const_t<T>>;
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};
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template<class T>
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using remove_cv_t = typename remove_cv<T>::type;
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template<class T>
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struct remove_reference{
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using type = T;
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};
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template<class T>
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struct remove_reference<T&>{
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using type = T;
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};
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template<class T>
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struct remove_reference<T&&>{
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using type = T;
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};
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template<class T>
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using remove_reference_t = typename remove_reference<T>::type;
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template<class T>
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struct remove_cvref{
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using type = remove_cv_t<remove_reference_t<T>>;
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};
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template<class T>
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using remove_cvref_t = typename remove_cvref<T>::type;
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#endif // REXY_STANDARD_CPP26
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template<class T, class = void>
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struct is_dereferencable : public std::false_type{};
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template<class T>
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struct is_dereferencable<T,std::void_t<decltype(*(std::declval<T>()))>> : public std::true_type{};
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template<class T>
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static constexpr bool is_dereferencable_v = is_dereferencable<T>::value;
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template<class T, class = void>
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struct is_pointer_dereferencable : public std::false_type{};
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template<class T>
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struct is_pointer_dereferencable<T,std::void_t<decltype(std::declval<T>().operator->())>> : public std::true_type{};
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template<class T>
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struct is_pointer_dereferencable<T*,std::void_t<T*>> : public std::true_type{};
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template<class T>
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static constexpr bool is_pointer_dereferencable_v = is_pointer_dereferencable<T>::value;
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template<class T, class = void>
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struct is_prefix_incrementable : public std::false_type{};
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template<class T>
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struct is_prefix_incrementable<T,std::void_t<decltype(++(std::declval<std::add_lvalue_reference_t<remove_cvref_t<T>>>()))>> : public std::true_type{};
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template<class T>
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static constexpr bool is_prefix_incrementable_v = is_prefix_incrementable<T>::value;
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template<class T, class = void>
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struct is_postfix_incrementable : public std::false_type{};
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template<class T>
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struct is_postfix_incrementable<T,std::void_t<decltype((std::declval<std::add_lvalue_reference_t<remove_cvref_t<T>>>())++)>> : public std::true_type{};
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template<class T>
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static constexpr bool is_postfix_incrementable_v = is_postfix_incrementable<T>::value;
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template<class T, class = void>
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struct is_equality_comparable : public std::false_type{};
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template<class T>
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struct is_equality_comparable<T,std::void_t<decltype(std::declval<T>() == std::declval<T>())>> : public std::true_type{};
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template<class T>
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static constexpr bool is_equality_comparable_v = is_equality_comparable<T>::value;
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template<class T, class = void>
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struct is_inequality_comparable : public std::false_type{};
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template<class T>
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struct is_inequality_comparable<T,std::void_t<decltype(std::declval<T>() != std::declval<T>())>> : public std::true_type{};
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template<class T>
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static constexpr bool is_inequality_comparable_v = is_inequality_comparable<T>::value;
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template<class T>
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struct is_legacy_iterator{
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static constexpr bool value = is_prefix_incrementable_v<T> && is_dereferencable_v<T>;
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};
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template<class T>
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static constexpr bool is_legacy_iterator_v = is_legacy_iterator<T>::value;
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template<class T, bool = is_legacy_iterator_v<T> &&
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is_inequality_comparable_v<T> &&
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is_pointer_dereferencable_v<T> &&
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is_postfix_incrementable_v<T>>
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struct is_legacy_input_iterator : public std::false_type{};
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template<class T>
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struct is_legacy_input_iterator<T,true>{
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static constexpr bool value = std::is_convertible_v<decltype(std::declval<T>() == std::declval<T>()),bool> &&
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std::is_same_v<decltype(*(std::declval<T>())),typename std::iterator_traits<T>::reference> &&
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std::is_same_v<decltype(++std::declval<std::add_lvalue_reference_t<remove_cvref_t<T>>>()),std::add_lvalue_reference_t<T>> &&
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std::is_convertible_v<decltype(*std::declval<std::add_lvalue_reference_t<remove_cvref_t<T>>>()++), typename std::iterator_traits<T>::value_type>;
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};
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template<class T>
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static constexpr bool is_legacy_input_iterator_v = is_legacy_input_iterator<T>::value;
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template<class T, class Value, bool = is_legacy_iterator_v<T> &&
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is_postfix_incrementable_v<T>>
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struct is_legacy_output_iterator : public std::false_type{};
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template<class T, class Value>
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struct is_legacy_output_iterator<T,Value,true>{
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static constexpr bool value =
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std::is_same_v<decltype(++std::declval<std::add_lvalue_reference_t<remove_cvref_t<T>>>()),std::add_lvalue_reference_t<T>> &&
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std::is_convertible_v<decltype(std::declval<std::add_lvalue_reference_t<remove_cvref_t<T>>>()++), std::add_lvalue_reference_t<std::add_const_t<T>>>;
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};
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template<class T, class Value>
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static constexpr bool is_legacy_output_iterator_v = is_legacy_output_iterator<T,Value>::value;
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}
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#endif
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