拷貝建構函式、explicit關鍵字

http://baike.baidu.com/view/1266959.htm

http://blog.csdn.net/fornormandy/article/details/79512

 

#include <iostream>#include <stdio.h>using namespace std;class C{public:    int i;//explicit C(const C& arg):i(10)   C(const C& arg)  // an explicit copy constructor   {    i = 10;      printf("in the copy constructor\n");   }   explicit C(int i )   // an explicit constructor   {      printf("\nin the constructor");   }   C()   {      i = 0;   }};C f(C c){    // C2558   c.i = 2;   printf("%d\n",c.i);   return c;   // first call to copy constructor}int main(){   C c;   c = f(c);   // c is copied 臨時拷貝   printf("%d\n",c.i);}

explicit關鍵字禁止隱式轉換、禁止拷貝構造