Unresolved External Reference Puzzle

[MikeCopeland]

I am getting an Unresolved External Symbol compiler error (in VS2013
Express) that I cannot understand. In a common .h file, I have the
following declaration:

template <class T>
string setwLeft(int width, T data); // format w/left & width
template <class T>
string setwRight(int width, T data); // format w/right & width

In its .cpp file, I have defined both functions:

template <class T>
string setwLeft(int width, T data) // format w/left & width
{
ostringstream oss;
oss << left << setw(width) << data;
return oss.str();
}
template <class T>
string setwRight(int width, T data) // format w/right & width
{
ostringstream oss;
oss << right << setw(width) << data;
return oss.str();
}

In my main .cpp files, I reference and use "setwLeft" frequently, but
references to "setwRight" produce the compiler error. What am I doing
wrong? TIA


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[Paavo Helde]

MikeCopeland <mrc...@cox.net> wrote in
news:MPG.2e820fefb...@news.eternal-september.org:

> I am getting an Unresolved External Symbol compiler error (in
> VS2013

This is a linker error, not a compiler error.

> Express) that I cannot understand. In a common .h file, I have the
> following declaration:
>
> template <class T>

[...]

> In its .cpp file, I have defined both functions:

See http://www.parashift.com/c++-faq/templates-defn-vs-decl.html

Cheers
Paavo

[Scott Lurndal]

MikeCopeland <mrc...@cox.net> writes:
> I am getting an Unresolved External Symbol compiler error (in VS2013
>Express) that I cannot understand. In a common .h file, I have the
>following declaration:
>
>template <class T>
>string setwLeft(int width, T data); // format w/left & width
>template <class T>
>string setwRight(int width, T data); // format w/right & width
>
> In its .cpp file, I have defined both functions:
>
>template <class T>
>string setwLeft(int width, T data) // format w/left & width
>{
> ostringstream oss;
> oss << left << setw(width) << data;
> return oss.str();
>}
>template <class T>
>string setwRight(int width, T data) // format w/right & width
>{
> ostringstream oss;
> oss << right << setw(width) << data;
> return oss.str();
>}
>
> In my main .cpp files, I reference and use "setwLeft" frequently, but
>references to "setwRight" produce the compiler error. What am I doing
>wrong? TIA
>
>

http://www.parashift.com/c++-faq/separate-template-fn-defn-from-decl.html