Erases all elements from the container. After this call,size() returns zero.

Invalidates any references, pointers, and iterators referring to contained elements.Any past-the-end iterator remains valid.

[edit]Complexity

Linear in the size of the container, i.e., the number of elements.

[edit]Example

#include <iostream>#include <string_view>#include <list> void print_info(std::string_view rem,conststd::list<int>& v){std::cout<< rem<<"{ ";for(constauto& value: v)std::cout<< value<<' ';std::cout<<"}\n";std::cout<<"Size="<< v.size()<<'\n';} int main(){std::list<int> container{1,2,3};    print_info("Before clear: ", container);    container.clear();    print_info("After clear: ", container);}

Before clear: { 1 2 3 }Size=3After clear: { }Size=0

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit]See also

• In other languages

• Deutsch
• Español
• Français
• Italiano
• 日本語
• Português
• Русский
• 中文