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