conversion-function.cpp [plain text]
extern "C" int printf(...);
struct S {
operator int();
};
S::operator int() {
return 10;
}
int f(S s) {
return s;
}
class X { public: operator int() { printf("operator int()\n"); return iX; }
public: operator float() { printf("operator float()\n"); return fX; }
X() : iX(100), fX(1.234) {}
int iX;
float fX;
};
X x;
struct Z {
operator X() { printf("perator X()\n"); x.iX += iZ; x.fX += fZ; return x; }
int iZ;
float fZ;
Z() : iZ(1), fZ(1.00) {}
};
Z z;
class Y { public: operator Z(){printf("perator Z()\n"); return z; }
};
Y y;
int count=0;
class O { public:
operator int(){ return ++iO; }
O() : iO(count++) {}
int iO;
};
void g(O a, O b) {
int i = (a) ? 1+a : 0;
int j = (a&&b) ? a+b : i;
if (a) { }
printf("i = %d j = %d a.iO = %d b.iO = %d\n", i, j, a.iO, b.iO);
}
int main() {
int c = X(Z(y)); printf("c = %d\n", c);
float f = X(Z(y));
printf("f = %f\n", f);
int i = x;
printf("i = %d float = %f\n", i, float(x));
i = int(X(Z(y)));
f = float(X(Z(y)));
printf("i = %d float = %f\n", i,f);
f = (float)x;
i = (int)x;
printf("i = %d float = %f\n", i,f);
int d = (X)((Z)y);
printf("d = %d\n", d);
int e = (int)((X)((Z)y));
printf("e = %d\n", e);
O o1, o2;
g(o1, o2);
}
class XB {
int a;
public:
operator int();
};
class Yb : public XB {
double b;
public:
operator char();
};
void f(Yb& a) {
int i = a; char ch = a; }
struct A {
operator int() const;
};