How can I use an array as map value?

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You can’t copy arrays by value like that.

Here are several solutions, but I recommend #4 for your needs:

  1. Use an std::vector instead of an array.

  2. Use a map of pointers to arrays of 3 elements:

    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. Use boost tuples instead of arrays of 3 elements.

  4. Instead of using an array make a new struct that takes 3 elements. Make the map<int, newstructtype>. Or wrap your array in a struct as follows:

    struct Triple
{
    int color[3];
};

// Later in code
Triple 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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