if ( yy == xx.getValue() ) 编译器扩展模拟代码

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《深度探索C++对象模型》P.239 中间部分伪码模拟：

// VC++ 2005 #include <stdio.h> class X; class Y; extern X g_x; extern Y g_y; class Y{public: Y() { printf("Y's default constructor/n"); } Y(Y const&) { printf("Y's copy constructor/n"); } ~Y() { printf("Y's destructor/n"); } bool operator==(Y const&) const { printf("Y: operator==()/n"); return true; }}; class X{public: X() { printf("X's default constructor/n"); } X(X const&) { printf("X's copy constructor/n"); } ~X() { printf("X's destructor/n"); } operator Y() const { printf("X: operator Y()/n"); return g_y; } X getValue() { printf("X: getValue()/n"); return g_x; }}; X g_x; Y g_y; int main(){ Y y; X x; printf("--------------------------------/n"); if (y == x.getValue()) { printf("y == x.getValue()/n"); } printf("--------------------------------/n"); return 0; }
X's default constructorY's default constructorY's default constructorX's default constructor--------------------------------X: getValue()X's copy constructorX: operator Y()Y's copy constructorY: operator==()Y's destructorX's destructory == x.getValue()--------------------------------X's destructorY's destructorY's destructorX's destructor