transform overloads
Synopses
Declared in <bslstl_optional.h>
Map the contained value through func, or return an empty optional.
template<class t_FUNC>
constexpr
auto
transform(t_FUNC&& func) &;Same as the transform overload taking &.
template<class t_FUNC>
constexpr
auto
transform(t_FUNC&& func) const &;Apply the specified func to the contained value and return the result as an rvalue optional.
template<class t_FUNC>
constexpr
auto
transform(t_FUNC&& func) &&;Apply the specified func to the contained value and return the result as a const rvalue optional.
template<class t_FUNC>
constexpr
auto
transform(t_FUNC&& func) const &&;Return Value
optional containing the result of func, or empty if disengaged
Parameters
Name |
Description |
func |
callable invoked with the contained value or when empty |
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