map::operator[] (STL/CLR)
將索引鍵對應到它的關聯對應值。
mapped_type operator[](key_type key);
參數
- Key - 索引鍵
若要搜尋的索引鍵值。
備註
成員函式的努力時,若要尋找具有相同順序來的項目key。 如果找到,則會傳回關聯的對應的值。 否則,它會插入value_type(key, mapped_type()) ,並傳回關聯 (預設值) 的對應值。 您用它來查閱對應的值,指定關聯的索引鍵,或者如果找不到機碼存在一個項目。
範例
// cliext_map_operator_sub.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();
System::Console::WriteLine("c1[{0}] = {1}",
L'A', c1[L'A']);
System::Console::WriteLine("c1[{0}] = {1}",
L'b', c1[L'b']);
// redisplay altered contents
for each (Mymap::value_type elem in c1)
System::Console::Write(" [{0} {1}]", elem->first, elem->second);
System::Console::WriteLine();
// alter mapped values and redisplay
c1[L'A'] = 10;
c1[L'c'] = 13;
for each (Mymap::value_type elem in c1)
System::Console::Write(" [{0} {1}]", elem->first, elem->second);
System::Console::WriteLine();
return (0);
}
需求
標頭: < cliext/地圖 >
Namespace: cliext