Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://en.cppreference.com/w/cpp/language/../memory/shared_ptr/../../container/vector/clear.html below:

std::vector<T,Allocator>::clear - cppreference.com

void clear();

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 iterators are also invalidated.

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

Calling clear() does not affect the result of capacity(). The standard's restriction on the changes to capacity is in the specification of reserve(), see SO.

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

Output:

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

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

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4