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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