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306 linhas
6.8 KiB
306 linhas
6.8 KiB
#pragma once
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#include <type_traits>
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#include <typeinfo>
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#include <cstddef>
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#include <limits>
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#include "gp/algorithm/min_max.hpp"
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namespace gp{
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/**
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* @brief Picks either of the types depending on the condition
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*
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* @tparam cond the condition
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* @tparam T the type picked when the condition is true
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* @tparam U the type picked when the condition is false
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*/
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template<bool cond, typename T, typename U>
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struct either
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{
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};
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template<typename T, typename U>
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struct either<true,T,U>
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{
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typedef T type;
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};
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template<typename T, typename U>
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struct either<false,T,U>
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{
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typedef U type;
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};
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/**
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* @brief Checks if the provided booleans are all true at compile time
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*/
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template<bool first, bool ...list>
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struct constexpr_all_of
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{
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static constexpr bool value = first && constexpr_all_of<list...>::value;
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};
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template<bool first>
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struct constexpr_all_of<first>
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{
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static constexpr bool value = first;
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};
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/**
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* @brief Checks if at least one of the provided booleans is true at compile time
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*/
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template<bool first, bool ...list>
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struct constexpr_any_of
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{
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static constexpr bool value = first || constexpr_any_of<list...>::value;
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};
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template<bool first>
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struct constexpr_any_of<first>
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{
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static constexpr bool value = first;
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};
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/**
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* @brief Checks if the provided type has a compile time defined size
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*
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* @tparam T the tested type
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* @return true if it has a defined size
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* @return false if its size may change due to inheritance or other factors
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*/
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template<typename T>
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constexpr bool is_fixed_size()
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{
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return std::is_final<T>::value
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|| std::is_fundamental<T>::value;
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}
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/**
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* @brief Checks if the provided typelist is all of fixed size
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*/
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template<typename T, typename ...rest>
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struct all_of_fixed_size
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{
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static constexpr bool value = is_fixed_size<T>() && all_of_fixed_size<rest...>::value;
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};
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template<typename T>
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struct all_of_fixed_size<T>
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{
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static constexpr bool value = is_fixed_size<T>();
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};
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/**
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* @brief Checks if the provided list contains the provided class
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*
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* @tparam Univ the class to look for
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*/
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template<typename Univ, typename T, typename ...rest>
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struct list_contains_class
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{
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static constexpr bool value = (
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std::is_same<T, Univ>::value
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) || list_contains_class<Univ, rest...>::value;
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};
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template<typename Univ, typename T>
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struct list_contains_class<Univ, T>
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{
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static constexpr bool value = std::is_same<T, Univ>::value;
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};
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/**
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* @brief gives the index of Univ from the end of the argument list
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*
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* @tparam Univ The type to look for
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*/
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template<typename Univ, typename T, typename ...rest>
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struct r_index_of
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{
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static constexpr std::size_t value = std::is_same<T, Univ>::value ? sizeof...(rest) : r_index_of<Univ, rest...>::value;
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};
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template<typename Univ, typename T>
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struct r_index_of<Univ, T>
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{
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static constexpr std::size_t value = std::is_same<T, Univ>::value ? 0 : std::numeric_limits<std::size_t>::max();
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};
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/**
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* @brief gives the type of the idx value from the end of the argument list
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*
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* @tparam idx The index to return the type of
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*/
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template<size_t idx, typename T, typename ...rest>
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struct r_index_at
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{
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using type =
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typename either<
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idx==sizeof...(rest),
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T,
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typename r_index_at<idx,rest...>::type
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>::type;
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};
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/**
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* @brief extracts the first type of the list
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*/
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template<typename U, typename ...rest>
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struct first_of {
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using type = U;
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};
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/**
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* @brief gives the size of the largest element in the provided list
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*
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* @return constexpr std::size_t equal to the largest size of all
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*/
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template<typename T, typename U, typename ...rest>
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constexpr std::size_t max_size()
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{
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if constexpr (sizeof...(rest) == 0)
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{
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return gp::max(sizeof(T),sizeof(U));
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}
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else
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{
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return max_size<
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typename either<
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( sizeof(T) > sizeof(U) ),
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T,
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U
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>::type,
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rest...>();
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}
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}
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/**
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* @brief remove reference state from the provided type
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*/
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template<typename T>
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struct remove_reference
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{
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using type = T;
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};
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template<typename T>
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struct remove_reference<T&>
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{
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using type = T;
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};
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template<typename T>
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struct remove_reference<T&&>
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{
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using type = T;
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};
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/**
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* @brief Has a value of true if the provided type has a size() function member
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*/
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template<typename T>
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struct has_size_interface
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{
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private:
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typedef std::true_type yes;
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typedef std::false_type no;
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template<typename U, size_t (U::*f)() const> struct SFINAE{};
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template<class C> static yes test(SFINAE<C,&C::size>*);
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template<class C> static no test(...);
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public:
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static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
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};
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/**
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* @brief Has a value of true if the provided type has a begin() function member
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*/
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template<typename T>
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struct has_begin_interface
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{
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private:
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typedef std::true_type yes;
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typedef std::false_type no;
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template<typename U, auto (U::*f)() const> struct SFINAE{};
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template<class C> static yes test(SFINAE<C,&C::begin>*);
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template<class C> static no test(...);
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public:
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static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
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};
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/**
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* @brief Has a value of true if the provided type has a end() function member
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*/
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template<typename T>
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struct has_end_interface
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{
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private:
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typedef std::true_type yes;
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typedef std::false_type no;
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template<typename U, auto (U::*f)() const> struct SFINAE{};
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template<class C> static yes test(SFINAE<C,&C::end>*);
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template<class C> static no test(...);
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public:
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static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
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};
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// TODO: Replace those with concepts
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template<typename T>
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using has_range_interface = constexpr_all_of<has_begin_interface<T>::value,has_end_interface<T>::value>;
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template<typename T>
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using has_measurable_range_interface = constexpr_all_of<has_range_interface<T>::value,has_size_interface<T>::value>;
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template<typename T>
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struct has_allocate_interface
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{
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private:
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typedef std::true_type yes;
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typedef std::false_type no;
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template<typename U, void* (U::*f)(size_t)> struct SFINAE{};
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template<class C> static yes test(SFINAE<C,&C::allocate>*);
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template<class C> static no test(...);
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public:
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static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
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};
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template<typename T>
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struct has_deallocate_interface
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{
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private:
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typedef std::true_type yes;
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typedef std::false_type no;
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template<typename U, bool (U::*f)(void*)> struct SFINAE{};
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template<class C> static yes test(SFINAE<C,&C::deallocate>*);
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template<class C> static no test(...);
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public:
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static constexpr bool value = std::is_same<yes,decltype(test<T>(nullptr))>::value;
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};
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template<typename T>
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using has_allocator_interface = constexpr_all_of<has_allocate_interface<T>::value,has_deallocate_interface<T>::value>;
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}
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