Checks whether a call to the
length() method can be replaced
with a call to
The emptiness of a container should be checked using the
instead of the
length() method. It is not guaranteed that
length() is a constant-time function, and it is generally more
efficient and also shows clearer intent to use
empty(). Furthermore some
containers may implement the
empty() method but not implement the
length() method. Using
empty() whenever possible makes it easier to
switch to another container in the future.
The check issues warning if a container has
length() methods matching following signatures:
size_type size() const; size_type length() const; bool empty() const;
size_type can be any kind of integer type.
A semicolon-separated list of class names for which the check will ignore comparisons of objects with default-constructed objects of the same type. If a class is listed here, the check will not suggest using
empty()instead of such comparisons for objects of that class. Default value is: ::std::array.