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我的OpenGL函数glutSpecialFunc需要一个带有3个int参数的void函数指针。这是很容易通过简单地OpenGL指向glutSpecialFunc到成员函数
glutSpecialFunc(processArrowKeys);
与全局函数做的,但我想它指向一个成员函数在一个结构在另一个文件中,像这样:
inputs.h
struct Keyboard {
bool leftMouseDown;
bool keyRight, keyLeft, keyUp, keyDown;
Keyboard() : leftMouseDown(false), keyRight(false), keyLeft(false), keyUp(false), keyDown(false) {
}
void Keyboard::processArrowKeys(int key, int x, int y) {
// process key strokes
if (key == GLUT_KEY_RIGHT) {
keyRight = true;
keyLeft = false;
keyUp = false;
keyDown = false;
}
else if (key == GLUT_KEY_LEFT) {
keyRight = false;
keyLeft = true;
keyUp = false;
keyDown = false;
}
else if (key == GLUT_KEY_UP) {
keyRight = false;
keyLeft = false;
keyUp = true;
keyDown = false;
}
else if (key == GLUT_KEY_DOWN) {
keyRight = false;
keyLeft = false;
keyUp = false;
keyDown = true;
}
}
};
的main.cpp
#include "inputs.h"
Keyboard keyboard;
...
int main(int argc, char **argv) {
...
// callbacks
glutDisplayFunc(displayWindow);
glutReshapeFunc(reshapeWindow);
glutIdleFunc(updateScene);
glutSpecialFunc(&keyboard.processArrowKeys); // compiler error: '&': illegal operation on bound member function expression
glutMouseFunc(mouseButton);
glutMotionFunc(mouseMove);
glutMainLoop();
return 0;
}
任何想法如何解决这个编译器错误?
我明白了,谢谢<3 –