absl::make_optional

Synopses

Declared in <absl/types/optional.h>

Creates an optional holding a copy of the given value.

template<typename T>
constexpr
decltype(std::make_optional(
    std::declval<T>()))
make_optional(T&& value);

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Creates an optional<T> by constructing T in place.

template<
    typename T,
    typename... Args>
constexpr
decltype(std::make_optional<T>(
    std::declval<Args>()...))
make_optional(Args&&... args);

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Creates an optional<T> from an initializer list and extra arguments.

template<
    typename T,
    typename U,
    typename... Args>
constexpr
decltype(std::make_optional<T>(
    std::declval<std::initializer_list<U>>(),
    std::declval<Args>()...))
make_optional(
    std::initializer_list<U> il,
    Args&&... args);

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