Solved

std::wstring wont work with overloaded std::operator<<

Posted on 2002-04-15
2
1,423 Views
Last Modified: 2013-12-14
hello experts,

can anyone tell me why this code compiles and runs:
---------------------------------------------------
#include <string>
#include <iostream>

using namespace std ;

void main()
{
    string msg="Hello!";
    cout << msg << endl;
}
-------------------------------------------------

whereas this code (using std::wstring instead of std::string)
-------------------------------------------------
#include <string>
#include <iostream>

using namespace std ;

void main()
{
    wstring msg=L"Hello";
    cout << msg << endl;
}
-------------------------------------------------
produces the following error:

error C2679 binary '<<' : no operator found which takes a right-hand operand of type 'std::wstring' (or there is no acceptable conversion)
?

string, wstring (calsses) and operator<< (function) are all templates defined in <string>.
what do i have to do in order to be able to use operator<< on types templated on std::basic_string other than std::string?

thanks!
0
Comment
Question by:managair
2 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 50 total points
ID: 6942035
Because "cout" has no "operator << (const wstring&);" - use "wcout" instead, e.g.

include <string>
#include <iostream>

using namespace std ;

void main()
{
   wstring msg=L"Hello";
   wcout << msg << endl;
}

See also "iostream", it has mutliple objects for handling UNICODE:

IOSTREAM:extern _CRTIMP ostream cout; // ANSI
IOSTREAM:extern _CRTIMP wostream wcout, wcerr, wclog; // UNICODE


0
 

Author Comment

by:managair
ID: 6942073
it makes sense that if i use a wstring i should use a wostream.

thanks!
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more …
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question