label.hpp

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#ifndef KOKKOS_EXECUTION_IMPL_LABEL_HPP
#define KOKKOS_EXECUTION_IMPL_LABEL_HPP
 
#if defined(__cpp_impl_reflection)
#    include <meta>
#endif
 
#include "Kokkos_Macros.hpp"
#ifdef KOKKOS_ENABLE_EXPERIMENTAL_CXX20_MODULES
import kokkos.core;
#else
#    include "Kokkos_Core.hpp"
#endif
 
#include "kokkos-execution/impl/fixed_string.hpp"
#include "kokkos-execution/impl/properties.hpp"

 
namespace Kokkos::Execution {
 
namespace Impl {
 
template <typename T>
struct Label;

template <typename T>
concept label = std::convertible_to<T, std::string> || stdexec::__is_instance_of<T, Label>;

template <typename T>
struct Label {
    using type = T;
 
    T m_value;
};

template <std::convertible_to<std::string> T>
Label(T) -> Label<std::string>;
 
template <typename T>
Label(T) -> Label<T>;
 
template <typename Data>
concept labeled = has_property<Data, Label>();

template <typename T>
requires std::convertible_to<T, std::string>
constexpr auto as_convertible_to_string(T&& value) STDEXEC_AUTO_RETURN(std::forward<T>(value))
 
template <typename T>
requires(!std::convertible_to<T, std::string>)
constexpr auto as_convertible_to_string(T&& value) STDEXEC_AUTO_RETURN(static_cast<std::string>(std::forward<T>(value)))
 
} // namespace Impl

#if !defined(__cpp_lib_define_static)
consteval Impl::Label<std::string_view> label(std::string_view str) noexcept {
    return {str};
}
#else
consteval Impl::Label<std::string_view> label(std::string_view str) noexcept {
    return {std::define_static_string(std::move(str))};
}
#endif
 
} // namespace Kokkos::Execution
 
#endif // KOKKOS_EXECUTION_IMPL_LABEL_HPP