[cfe-dev] [libc++]x=move(x) behavior

[chen xu via cfe-dev]

Hi, my project code (linux, Clang as compiler and LLVM libcxx as c++ library) will have the execution of x=std::move(x) in some code path (not directly, but sometimes it will happen via levels of function calls and parameter-pass by reference, etc.), and it turns out x is cleared after this x = std::move(x). I tried gnu c++ library, and msvc c++ library (on windows), both keep x untouched. 
I am wondering if this could be fixed in LLVM libcxx, as it seems making more sense not to clear x when moving x to itself. Thanks. Below is a sample code for repro.  Thanks a lot. 
#include <iostream>using namespace std;
class Test {

public:

    Test() :
x("test")  { } 

    void MoveX() {

      
cout << "before x=move(x), x : " << x;

       x=move(x);

       cout << "after x=move(x), x : " << x;     }private:

    string x;

};
int main(int argc, char** argv){    Test test;    test.MoveX();    return 0;}
The output would be like 
before x=move(x), x : testafter x=move(x), x :  		 	   		  
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