blob: 6f8a1a89c9bdb050a94cebe2cabd56be48a3ff0d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
#pragma once
#include <type_traits>
#include <Corrade/Containers/Optional.h>
namespace std {
template<class T> struct tuple_size<Corrade::Containers::Optional<T>> : std::integral_constant<std::size_t, 2> {};
template<class T> struct tuple_element<0, Corrade::Containers::Optional<T>> { using type = T; };
template<class T> struct tuple_element<1, Corrade::Containers::Optional<T>> { using type = bool; };
} // namespace std
namespace Corrade::Containers {
template<std::size_t N, class T>
std::tuple_element_t<N, Optional<T>>
get(const Optional<T>& value) noexcept(std::is_nothrow_default_constructible_v<T> && std::is_nothrow_copy_constructible_v<T>)
{
static_assert(N < 2);
static_assert(std::is_default_constructible_v<T> && std::is_copy_constructible_v<T>);
if constexpr (N == 0)
return value ? *value : T{};
if constexpr (N == 1)
return bool(value);
}
} // namespace Corrade::Containers
|
