[Dev-C++] template and prototype

[<h.r...@gm...>]

Hello,

Is it forbidden to have a prototype of a template in a header file ? 
For example:

a.h
template <class T> T sqr(T x);

a.cpp
template <class T> T sqr(T x) { return x * x; }

this doesnt link.
If I put the definition 
template <class T> T sqr(T x) { return x * x; }
in the header, it works.

Thanks in advance
Horst

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Horst Rößner
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