operator<= (map)
測試,如果在運算子左方的對應物件小於或等於右邊的對應物件。
bool operator<=(
const map <Key, Type, Traits, Allocator>& _Left,
const map <Key, Type, Traits, Allocator>& _Right
);
參數
_Left
型別 map物件。_Right
型別 map物件。
傳回值
true ,如果在運算子左方的對應小於或等於對應在運算子右方的;否則 false。
圖例
在對應物件之間的比較可能會依據其項目比較配對。 小於或等於兩個物件之間的關聯性會根據第一個要比較不相等的項目。
範例
// map_op_le.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
map <int, int> m1, m2, m3, m4;
int i;
typedef pair <int, int> Int_Pair;
for ( i = 1 ; i < 3 ; i++ )
{
m1.insert ( Int_Pair ( i, i ) );
m2.insert ( Int_Pair ( i, i * i ) );
m3.insert ( Int_Pair ( i, i - 1 ) );
m4.insert ( Int_Pair ( i, i ) );
}
if ( m1 <= m2 )
cout << "The map m1 is less than or equal to the map m2." << endl;
else
cout << "The map m1 is greater than the map m2." << endl;
if ( m1 <= m3 )
cout << "The map m1 is less than or equal to the map m3." << endl;
else
cout << "The map m1 is greater than the map m3." << endl;
if ( m1 <= m4 )
cout << "The map m1 is less than or equal to the map m4." << endl;
else
cout << "The map m1 is greater than the map m4." << endl;
}
需求
標頭:<map>
命名空間: std