Re: r-value references not working in MSVC (VS2010) ?
On 2012-10-11 6:47 PM, ctgqumgf@sharklasers.com wrote:
Compiling the code below with g++ 4.7.0 produces expected
output
[&] Hello!
[&&] Hello!
Whereas MSVC 16.00.x produces output
[&] Hello!
[&] Hello!
Does MSVC not fully understand r-value references yet?
#include <iostream>
#include <string>
void print(const std::string& s) {
std::cout << "[&] " << s << std::endl;
}
void print(std::string&& s) {
std::cout << "[&&] " << s << std::endl;
}
int main() {
std::string s = "Hello!";
print(s);
print("Hello!");
}
Yes, MSVC 16 (VS2010) apparently doesn't bind literals to an rvalue
reference there. With
print(std::string("Hello!"));
it does call use the version of print taking an rvalue reference.
There's a detailed explanation on
http://msdn.microsoft.com/en-us/library/hh567368.aspx
under Rvalue References.
"[...] The rvalue references v2.0 rules said, string&& cannot bind to
"strval" because "strval" is an lvalue, and therefore, push_back(const
string&) is the only viable overload. [...]"
It works in MSVC 17 (VS2012).
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