General Purpose library for Freestanding C++ and POSIX systems
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234 rader
5.0 KiB

#pragma once
#include <type_traits>
#include <typeinfo>
#include <cstddef>
#include <limits>
#include "gp/algorithm/min_max.hpp"
namespace gp{
template<bool cond, typename T, typename U>
struct either
{
};
template<typename T, typename U>
struct either<true,T,U>
{
typedef T type;
};
template<typename T, typename U>
struct either<false,T,U>
{
typedef U type;
};
template<bool first, bool ...list>
struct constexpr_all_of
{
static constexpr bool value = first && constexpr_all_of<list...>::value;
};
template<bool first>
struct constexpr_all_of<first>
{
static constexpr bool value = first;
};
template<bool first, bool ...list>
struct constexpr_any_of
{
static constexpr bool value = first || constexpr_any_of<list...>::value;
};
template<bool first>
struct constexpr_any_of<first>
{
static constexpr bool value = first;
};
template<typename T>
constexpr bool is_fixed_size()
{
return std::is_final<T>::value
|| std::is_fundamental<T>::value;
}
template<typename T, typename ...rest>
struct all_of_fixed_size
{
static constexpr bool value = is_fixed_size<T>() && all_of_fixed_size<rest...>::value;
};
template<typename T>
struct all_of_fixed_size<T>
{
static constexpr bool value = is_fixed_size<T>();
};
template<typename Univ, typename T, typename ...rest>
struct list_contains_class
{
static constexpr bool value = (
std::is_same<T, Univ>::value
) || list_contains_class<Univ, rest...>::value;
};
template<typename Univ, typename T>
struct list_contains_class<Univ, T>
{
static constexpr bool value = std::is_same<T, Univ>::value;
};
template<typename Univ, typename T, typename ...rest>
struct r_index_of
{
static constexpr std::size_t value = std::is_same<T, Univ>::value ? sizeof...(rest) : r_index_of<Univ, rest...>::value;
};
template<typename Univ, typename T>
struct r_index_of<Univ, T>
{
static constexpr std::size_t value = std::is_same<T, Univ>::value ? 0 : std::numeric_limits<std::size_t>::max();
};
template<size_t idx, typename T, typename ...rest>
struct r_index_at
{
using type = typename either<idx==sizeof...(rest),T,typename r_index_at<idx,rest...>::type>::type;
};
template<typename T, typename U, typename ...rest>
constexpr std::size_t max_size()
{
if constexpr (sizeof...(rest) == 0)
{
return gp::max(sizeof(T),sizeof(U));
}
else
{
return max_size<
typename either<
( sizeof(T) > sizeof(U) ),
T,
U
>::type,
rest...>();
}
}
template<typename T>
struct remove_reference
{
using type = T;
};
template<typename T>
struct remove_reference<T&>
{
using type = T;
};
template<typename T>
struct remove_reference<T&&>
{
using type = T;
};
template<typename T>
struct has_size_interface
{
private:
typedef std::true_type yes;
typedef std::false_type no;
template<typename U, size_t (U::*f)() const> struct SFINAE{};
template<class C> static yes test(SFINAE<C,&C::size>*);
template<class C> static no test(...);
public:
static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
};
template<typename T>
struct has_begin_interface
{
private:
typedef std::true_type yes;
typedef std::false_type no;
template<typename U, auto (U::*f)() const> struct SFINAE{};
template<class C> static yes test(SFINAE<C,&C::begin>*);
template<class C> static no test(...);
public:
static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
};
template<typename T>
struct has_end_interface
{
private:
typedef std::true_type yes;
typedef std::false_type no;
template<typename U, auto (U::*f)() const> struct SFINAE{};
template<class C> static yes test(SFINAE<C,&C::end>*);
template<class C> static no test(...);
public:
static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
};
template<typename T>
using has_range_interface = constexpr_all_of<has_begin_interface<T>::value,has_end_interface<T>::value>;
template<typename T>
using has_measurable_range_interface = constexpr_all_of<has_range_interface<T>::value,has_size_interface<T>::value>;
template<typename T>
struct has_allocate_interface
{
private:
typedef std::true_type yes;
typedef std::false_type no;
template<typename U, void* (U::*f)(size_t)> struct SFINAE{};
template<class C> static yes test(SFINAE<C,&C::allocate>*);
template<class C> static no test(...);
public:
static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
};
template<typename T>
struct has_deallocate_interface
{
private:
typedef std::true_type yes;
typedef std::false_type no;
template<typename U, bool (U::*f)(void*)> struct SFINAE{};
template<class C> static yes test(SFINAE<C,&C::deallocate>*);
template<class C> static no test(...);
public:
static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
};
template<typename T>
using has_allocator_interface = constexpr_all_of<has_allocate_interface<T>::value,has_deallocate_interface<T>::value>;
}