stl中map函数_map :: empty()函数以及C ++ STL中的Example

stl中map函数

C ++ STL映射:: empty() (C++ STL map::empty())

It is built-in function in C++ STL and used to check whether the map container is empty or not i.e whether its size is 0 or not?

它是C ++ STL中的内置函数,用于检查地图容器是否为空,即其大小是否为0?

Syntax:

句法:

    myMap.empty()

Where, myMap is the object of class map.

其中, myMap是类映射的对象。

Parameters: None - It does not accept any parameters.

参数:无-不接受任何参数。

Return value: It returns True, if map is empty and returns False, otherwise.

返回值:如果map为空,则返回True,否则返回False。

Example:

例:

#include  
#include  
using namespace std; 

int main() {
     
	// Example of Non Empty map
	map myMap; 

	myMap['i'] = "include"; 
	myMap['h'] = "help"; 

	if (myMap.empty()) {
      
		cout << "myMap is Empty !!"; 
	} 
	else {
      
		cout << "myMap contains elements , Not Empty!!"; 
	} 

	cout< empMap; 

	if (empMap.empty()) {
      
		cout << "empMap is Empty !!"; 
	} 
	else {
      
		cout << "empMap contains elements , Not Empty!!"; 
	} 

	return 0;     
} 

Output

输出量

myMap contains elements , Not Empty!!

empMap is Empty !!


翻译自: https://www.includehelp.com/stl/map-empty-function-with-example-in-cpp-stl.aspx

stl中map函数

你可能感兴趣的:(c++,java,python,js,javascript)