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C++ Tuple to type generation
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#include <tuple> | |
///////////////////////////////////////////////// TUPLE GENERATOR ///////////////////////////////////////////////// | |
template <unsigned int N, typename T> | |
struct TupleGenerator { | |
using type = decltype(std::tuple_cat(std::tuple<T>(), typename TupleGenerator<N - 1, T>::type())); | |
}; | |
template <typename T> | |
struct TupleGenerator<0, T> { | |
using type = decltype(std::tuple<>()); | |
}; | |
template <unsigned int N, typename T> | |
using TupleGenerator_t = typename TupleGenerator<N, T>::type; | |
///////////////////////////////////////////////// TUPLE TO PACK ///////////////////////////////////////////////// | |
template<template<typename...> class T, typename> | |
struct CreateTypeWithTuple { }; | |
template<template<typename...> class T, typename... Ts> | |
struct CreateTypeWithTuple<T, std::tuple<Ts...>> | |
{ | |
using type = T<Ts...>; | |
}; | |
template<template<typename...> class T, typename... Ts> | |
using CreateTypeWithTuple_t = typename CreateTypeWithTuple <T,Ts...>::type; | |
///////////////////////////////////////////////// EXAMPLE ///////////////////////////////////////////////// | |
template<typename... Ts> | |
struct container { }; | |
auto main() ->int | |
{ | |
using X = container<float,float,float>; | |
using Y = CreateTypeWithTuple_t<container, TupleGenerator_t<3, float>>; | |
static_assert( | |
std::is_same<Y,X>::value, | |
"Error!"); | |
} |
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