C++中 使用数组作为map容器VAlue值的解决方法
<br />1)是用Vector容器代替数组<br />2)使用数组指针(需要注意局部变量的问题,指针是否需要用new创建)<br />intred[3] ={1,0,0};<br />intgreen[3]={0,1,0};<br />intblue[3] ={0,0,1};<br />std::map<int,int(*)[3]>colours;<br />colours.insert(
1)是用Vector容器代替数组
2)使用数组指针(需要注意局部变量的问题,指针是否需要用new创建)
int red [ 3 ] = { 1 , 0 , 0 };
int green [ 3 ] = { 0 , 1 , 0 };
int blue [ 3 ] = { 0 , 0 , 1 };
std :: map < int , int (*)[ 3 ]> colours ;
colours . insert ( std :: pair < int , int (*)[ 3 ]>(( GLUT_LEFT_BUTTON ,& red ));
colours . insert ( std :: pair < int , int (*)[ 3 ]>(( GLUT_MIDDLE_BUTTON ,& blue ));
colours . insert ( std :: pair < int , int (*)[ 3 ]>(( GLUT_RIGHT_BUTTON ,& green ));
//Watch out for scope here, you may need to create the arrays on the heap.
3)使用结构体来构造代替数组的元素,或把数组直接放在结构体内
struct Triple
{
int color [ 3 ];
};
//Later in code
Tripple red = { 1 , 0 , 0 }, green = { 0 , 1 , 0 }, blue = { 0 , 0 , 1 };
std :: map < int , Triple > colours ;
colours . insert ( std :: pair < int , Triple >(( GLUT_LEFT_BUTTON , red ));
colours . insert ( std :: pair < int , Triple >(( GLUT_MIDDLE_BUTTON , blue ));
colours . insert ( std :: pair < int , Triple >(( GLUT_RIGHT_BUTTON , green ));
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