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Simon Brand
2017-10-21 10:35:06 +01:00
parent af8ff0b66c
commit ff1b9af0bd
2 changed files with 80 additions and 15 deletions
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optional.hpp
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@@ -1124,41 +1124,62 @@ public:
return has_value() ? std::move(*this) : std::forward<F>(f)();
}
/// \group map_or
/// \brief Maps the stored value with `f` if there is one, otherwise returns `u`
/// \details If there is a value stored, then `f` is called with `**this` and the value is returned.
/// Otherwise `u` is returned.
template <class F, class U> U map_or(F &&f, U &&u) & {
return has_value() ? detail::invoke(std::forward<F>(f), **this)
: std::forward<U>(u);
}
/// \group map_or_val
/// \brief Maps the stored value with `f` if there is one, otherwise returns `u`
/// \details If there is a value stored, then `f` is called with `std::move(**this)` and the value is returned.
/// Otherwise `u` is returned.
template <class F, class U> U map_or(F &&f, U &&u) && {
return has_value() ? detail::invoke(std::forward<F>(f), std::move(**this))
: std::forward<U>(u);
}
/// \group map_or
template <class F, class U> U map_or(F &&f, U &&u) const & {
return has_value() ? detail::invoke(std::forward<F>(f), **this)
: std::forward<U>(u);
}
/// \group map_or_val
template <class F, class U> U map_or(F &&f, U &&u) const && {
return has_value() ? detail::invoke(std::forward<F>(f), std::move(**this))
: std::forward<U>(u);
}
/// \group map_or_else
/// \brief Maps the stored value with `f` if there is one, otherwise calls `u` and returns the result.
/// \details If there is a value stored, then `f` is called with `**this` and the value is returned.
/// Otherwise `std::forward<U>(u)()` is returned.
template <class F, class U> U map_or_else(F &&f, U &&u) & {
return has_value() ? detail::invoke(std::forward<F>(f), **this)
: std::forward<U>(u)();
}
/// \group map_or_else_rval
/// \brief Maps the stored value with `f` if there is one, otherwise calls `u` and returns the result.
/// \details If there is a value stored, then `f` is called with `std::move(**this)` and the value is returned.
/// Otherwise `std::forward<U>(u)()` is returned.
template <class F, class U> U map_or_else(F &&f, U &&u) && {
return has_value() ? detail::invoke(std::forward<F>(f), std::move(**this))
: std::forward<U>(u)();
}
/// \group map_or_else
template <class F, class U> U map_or_else(F &&f, U &&u) const & {
return has_value() ? detail::invoke(std::forward<F>(f), **this)
: std::forward<U>(u)();
}
/// \group map_or_else_rval
template <class F, class U> U map_or_else(F &&f, U &&u) const && {
return has_value() ? detail::invoke(std::forward<F>(f), std::move(**this))
: std::forward<U>(u)();