compile_time_optional.hpp

Go to the documentation of this file.

#ifndef KOKKOS_EXECUTION_IMPL_COMPILE_TIME_OPTIONAL_HPP
#define KOKKOS_EXECUTION_IMPL_COMPILE_TIME_OPTIONAL_HPP
 
#include <concepts>
#include <type_traits>
#include <utility>
 
namespace Kokkos::Execution::Impl {

template <bool Enabled, typename T>
struct CompileTimeOptional;
 
template <typename T>
struct CompileTimeOptional<false, T> {
    using value_type = T;
 
    constexpr CompileTimeOptional() noexcept = default;

    template <typename... Args>
    requires(!(sizeof...(Args) == 1 && (std::same_as<std::remove_cvref_t<Args>, CompileTimeOptional> && ...)))
    constexpr explicit CompileTimeOptional(Args&&...) noexcept {
    }
};
 
template <typename T>
struct CompileTimeOptional<true, T> {
    using value_type = T;
 
    template <typename... Args>
    requires(
        std::constructible_from<T, Args...>
        && !(sizeof...(Args) == 1 && (std::same_as<std::remove_cvref_t<Args>, CompileTimeOptional> && ...)))
    constexpr explicit CompileTimeOptional(Args&&... args) noexcept(std::is_nothrow_constructible_v<T, Args&&...>)
        : value(std::forward<Args>(args)...) {
    }
 
    T value;
};
 
} // namespace Kokkos::Execution::Impl
 
#endif // KOKKOS_EXECUTION_IMPL_COMPILE_TIME_OPTIONAL_HPP