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std::flat_map::clear(3)	      C++ Standard Libary      std::flat_map::clear(3)

NAME
       std::flat_map::clear - std::flat_map::clear

Synopsis
	  void clear() noexcept;  (since C++23)

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

	  Invalidates any references, pointers,	 and  iterators	 referring  to
       contained elements.

Parameters
	  (none)

Return value
	  (none)

Complexity
	  Linear in the	size of	the container adaptor, i.e., the number	of el-
       ements.

Example
       // Run this code

	#include <iostream>
	#include <string_view>
	#include <flat_map>

	void  print_info(std::string_view rem, const std::flat_map<int,	char>&
       v)
	{
	    std::cout << rem <<	"{ ";
	    for	(const auto& [key, value] : v)
		std::cout << '[' << key	<< "]:"	<< value << ' ';
	    std::cout << "}\n";
	    std::cout << "Size=" << v.size() <<	'\n';
	}

	int main()
	{
	    std::flat_map<int, char> container{{1, 'x'}, {2, 'y'}, {3, 'z'}};
	    print_info("Before clear: ", container);
	    container.clear();
	    print_info("After clear: ",	container);
	}

Output:
	Before clear: {	[1]:x [2]:y [3]:z }
	Size=3
	After clear: { }
	Size=0

See also
	  erase	erases elements
		(public	member function)

http://cppreference.com		  2024.06.10	       std::flat_map::clear(3)

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