beman::optional::optional::transform

Returns an optional containing the result of applying f to the stored value, or a default value if there is no stored value.

Synopses

Declared in <beman/optional/optional.hpp>

Returns an optional containing the result of applying f to the stored value, or a default value if there is no stored value.

template<class F>
constexpr
auto
transform(F&& f) &;

Returns an optional containing the result of applying f to the stored value, or a default value if there is no stored value.

template<class F>
constexpr
auto
transform(F&& f) &&;

Returns an optional containing the result of applying f to the stored value, or a default value if there is no stored value.

template<class F>
constexpr
auto
transform(F&& f) const &;

Returns an optional containing the result of applying f to the stored value, or a default value if there is no stored value.

template<class F>
constexpr
auto
transform(F&& f) const &&;

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