optional_ref.hpp

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#ifndef KOKKOS_EXECUTION_IMPL_OPTIONAL_REF_HPP
#define KOKKOS_EXECUTION_IMPL_OPTIONAL_REF_HPP
 
#include "Kokkos_Assert.hpp"
 
namespace Kokkos::Execution::Impl {

template <typename T>
struct OptionalRef {
    T* m_ptr = nullptr;
 
    OptionalRef() = default;
 
    explicit constexpr OptionalRef(T& value) noexcept
        : m_ptr(std::addressof(value)) {
    }
 
    explicit constexpr OptionalRef(T&&) = delete;
 
    [[nodiscard]]
    constexpr bool has_value() const noexcept {
        return m_ptr != nullptr;
    }
 
    [[nodiscard]]
    constexpr T& get() const noexcept {
        KOKKOS_EXPECTS(has_value());
        return *m_ptr;
    }
};
 
} // namespace Kokkos::Execution::Impl
 
#endif // KOKKOS_EXECUTION_IMPL_OPTIONAL_REF_HPP