Built-in to wide string conversion

[Saeed Amrollahi]

Dear All
Hi

I usually use the following function for built-in types to std::string
conversion:
// convert a type (typically built-in type) to std::string
template<class T>
inline std::string ToStdStr(const T& t)
{
std::istringstream s;
s << t;
return s.str();
}

What is the equivalent function for std::wstring conversion?
Unfortunately the following code doesn't work:
// convert a type (typically built-in type) to std::wstring
template<class T>
inline std::wstring ToWideStdStr(const T& t)
{
std::wistringstream s;
s << t;
return s.str();
}

In other words, I am looking for the << operator for wstring. Does it
relate to locale?

Thanks in advance.

Regards,
Saeed Amrollahi

[Alf P. Steinbach]

* Saeed Amrollahi:

Dear All
Hi

I usually use the following function for built-in types to std::string
conversion:
// convert a type (typically built-in type) to std::string
template<class T>
inline std::string ToStdStr(const T& t)
{
std::istringstream s;

An istringstream is the wrong kind of stream.

Use an ostringstream.

Or better, use boost::lexical_cast instead of building your own.

s << t;
return s.str();
}

What is the equivalent function for std::wstring conversion?
Unfortunately the following code doesn't work:
// convert a type (typically built-in type) to std::wstring
template<class T>
inline std::wstring ToWideStdStr(const T& t)
{
std::wistringstream s;
s << t;
return s.str();
}

In other words, I am looking for the << operator for wstring.

#include <iostream // std::cout, std::ostream
#include <ostream // operator<<, std::endl
#include <sstream // std::ostringstream

template<class T>
inline std::wstring wideString(const T& t)
{
std::wostringstream s;
s << t;
return s.str();
}

int main()
{
using namespace std;

wcout << wideString( 123 ) << endl;
}
Note that MingW g++ (Windows version of g++) lacks support for wide streams.

Does it relate to locale?

Yes. But it's a mess, so I'm no longer familiar with it. Hopefully if you have
any concrete questions in that direction, others can answer them.

Cheers, & hth.,

- Alf

[Saeed Amrollahi]

On Apr 14, 10:11*am, "Alf P. Steinbach" <[e-mail]:

* Saeed Amrollahi:

Dear All
Hi

I usually use the following function for built-in types to std::string
conversion:
// convert a type (typically built-in type) to std::string
template<class T>
inline std::string ToStdStr(const T& t)
{
* *std::istringstream s;

An istringstream is the wrong kind of stream.

Use an ostringstream.

Or better, use boost::lexical_cast instead of building your own.

* *s << t;
* *return s.str();
}

What is the equivalent function for std::wstring conversion?
Unfortunately the following code doesn't work:
// convert a type (typically built-in type) to std::wstring
template<class T>
inline std::wstring ToWideStdStr(const T& t)
{
* *std::wistringstream s;
* *s << t;
* *return s.str();
}

In other words, I am looking for the << operator for wstring.

#include <iostream* * // std::cout, std::ostream
#include <ostream* * *// operator<<, std::endl
#include <sstream* * *// std::ostringstream

template<class T>
inline std::wstring wideString(const T& t)
{
* * *std::wostringstream s;
* * *s << t;
* * *return s.str();

}

int main()
{
* * *using namespace std;

* * *wcout << wideString( 123 ) << endl;

}

Note that MingW g++ (Windows version of g++) lacks support for wide streams.

Does it relate to locale?

Yes. *But it's a mess, so I'm no longer familiar with it. *Hopefully if you have
any concrete questions in that direction, others can answer them.

Cheers, & hth.,

- Alf- Hide quoted text -

- Show quoted text -

Dear Alf
Hi

As before your answer is good and resolved my problem. Of course I
made mistake in
using ostrstream/wostrstream.

thank you
Saeed