operator< (map) (STL/CLR)

發行項
06/10/2015

列表小於比較。

template<typename Key,
    typename Mapped>
    bool operator<(map<Key, Mapped>% left,
        map<Key, Mapped>% right);

參數

left
要比較的左邊容器。
right
要比較的右邊容器。

備註

若在 !(right[i] < left[i]) 的最低位置 i，left[i] < right[i] 也為真，則運算子函式傳回 true。否則，會傳回 left->size() < right->size()。您可用它來測試在兩個地圖逐一比較項目後，left 是否在 right 之前已排序。

範例

// cliext_map_operator_lt.cpp 
// compile with: /clr 
#include <cliext/map> 
 
typedef cliext::map<wchar_t, int> Mymap; 
int main() 
    { 
    Mymap c1; 
    c1.insert(Mymap::make_value(L'a', 1)); 
    c1.insert(Mymap::make_value(L'b', 2)); 
    c1.insert(Mymap::make_value(L'c', 3)); 
 
// display contents " [a 1] [b 2] [c 3]" 
    for each (Mymap::value_type elem in c1) 
        System::Console::Write(" [{0} {1}]", elem->first, elem->second); 
    System::Console::WriteLine(); 
 
// assign to a new container 
    Mymap c2; 
    c2.insert(Mymap::make_value(L'a', 1)); 
    c2.insert(Mymap::make_value(L'b', 2)); 
    c2.insert(Mymap::make_value(L'd', 4)); 
 
// display contents " [a 1] [b 2] [d 4]" 
    for each (Mymap::value_type elem in c2) 
        System::Console::Write(" [{0} {1}]", elem->first, elem->second); 
    System::Console::WriteLine(); 
 
    System::Console::WriteLine("[a b c] < [a b c] is {0}", 
        c1 < c1); 
    System::Console::WriteLine("[a b c] < [a b d] is {0}", 
        c1 < c2); 
    return (0); 
    }