模板遵循两阶段编译模型.
struct X{
private:
void f(){}
};
template<class T> void f(T t){
int; // gives error in phase 1 (even if f(x) call is commented in main)
t.f(); // gives error only when instantiated with T = X, as x.f() is private, in phase 2
}
int main(){
X x;
f(x);
}
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