Applies a function to the stored value if there is one.

Synopsis

Declared in <beman/optional/optional.hpp>

template<class F>
constexpr
optional<std::invoke_result_t<F, T&>>
transform(F&& f) const;

Description

The return type is the same as

{std::invoke_result_t<F, T&>},
 but wrapped in an optional.

Return Value

optional<std::invoke_result_t<F, T&>>

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