VS2008 C ++编译器错误？

Question

this compiles :-)

string name;
name = 1;

this does not:

string name = 1;

any thoughts?

I know that this is wrong. . . that is not the point. The first gives a smiley face.

Answer 1

The first compiles because the assignment operator is called what has one signature of "string& operator= ( char c )" and the compiler can convert 1 into a char.

The second won't compile because it calls the copy constructor which has no compatible signature.

Answer 2

The second example is really initialization rather than assignment, ie it calls a constructor rather than operator= . Evidently class string does not have a constructor that takes an integer as an argument, but it's assignment operator is ok with it. And the reason you get a smiley face is that it is the character with the ASCII value of 1.

By the way, this is not specific to Visual Studio. Any C++ compiler should behave the same way.

Answer 3

Not to do with the question, but why don't you (and many others) post compilable code. Would :

#include <string>
using namespace std;

int main() {
    string name;
    name = 1;
    string name2 = 1;
}

have been too much to ask for? Given that, we can see that "string" actually refers to std::string and not some random class.