beman::optional::make_optional

Synopses

Declared in <beman/optional/optional.hpp>

Creates an optional holding a decayed copy of the given value.

template<
    int = 0,
    class T>
constexpr
optional<std::decay_t<T>>
make_optional(T&& t) noexcept(/* see-below */)
requires std::is_constructible_v<std::decay_t<T>, T>;

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Creates an optional<T> constructing the value in-place from the given arguments.

template<
    typename T,
    typename... Args>
constexpr
optional<T>
make_optional(Args&&... args) noexcept(/* see-below */)
requires std::is_constructible_v<T, Args...>;

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Creates an optional<T> constructing the value in-place from an initializer list and arguments.

template<
    typename T,
    typename U,
    typename... Args>
constexpr
optional<T>
make_optional(
    std::initializer_list<U> il,
    Args&&... args) noexcept(/* see-below */)
requires std::is_constructible_v<T, std::initializer_list<U>&, Args...>;

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