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Add map function to pass another ok result for success case.

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This commit is contained in:
Nerijus Arlauskas 2016-07-07 15:30:12 +03:00
parent 8b0e3f0e13
commit 89c1bc061b
2 changed files with 14 additions and 0 deletions
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3
src/maybe/result.hpp
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@ -220,6 +220,9 @@ namespace maybe {
template <typename F>
constexpr auto map(F f) noexcept -> maybe::result<typename std::result_of<F(T)>::type, E>;
template <typename U>
constexpr auto map_value(U value) noexcept -> maybe::result<U, E>;
/**
* Maps a result<T, E> to result<T, U> (where U is return value of F(E)) by applying a
* function to a

11
src/maybe/result.inline.hpp
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@ -109,6 +109,17 @@ constexpr auto maybe::result<T, E>::map(F f) noexcept
return return_result_t::ok(f(std::forward<T>(ok_value())));
};
template <typename T, typename E>
template <typename U>
constexpr auto maybe::result<T, E>::map_value(U value) noexcept -> maybe::result<U, E>
{
if (is_err()) {
return maybe::result<U, E>::err(std::forward<E>(err_value()));
}
return maybe::result<U, E>::ok(std::forward<U>(value));
};
template <typename T, typename E>
template <typename F>
constexpr auto maybe::result<T, E>::map_err(F f) noexcept