Hi, guys,
I declare a template method in one template class in one library.
Compiling is OK, but link is not OK.
Header File is:
<code>
template <typename P = float>
class TESTLIB_API Linear
{
public:
P x;
P y;
P z;
Linear(P x_, P y_, P z_): x(x_), y(y_), z(z_)
{
}
template <typename R>
void Distance(Linear<R>& rlinear);
};
</code>
Source CPP file is:
<code>
template <typename P>
template <typename R>
void Linear<P>::Distance(Linear<R>& rlinear)
{
x = (P) rlinear.x;
}
template class Linear<>;
template class Linear<double>;
template void Linear<float>::Distance(Linear<float>& rlinear);
template void Linear<float>::Distance(Linear<double>& rlinear);
template void Linear<double>::Distance(Linear<float>& rlinear);
template void Linear<double>::Distance(Linear<double>& rlinear);
</code>
Main.cpp is:
<code>
Linear<la(1,1,1);
Linear<lb(2,2,2);
la.Distance(lb);
</code>
Template and its implementation are put in library, and main code is
in application.
The link error is:
2>Linking...
2>LINK : warning LNK4075: ignoring '/INCREMENTAL' due to '/PROFILE'
specification
2>Ball.obj : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/
OPT:REF' specification
2>Hello.obj : error LNK2019: unresolved external symbol "public: void
__thiscall Linear<float>::Distance<float>(class Linear<float&)" (??
$Distance@M@?$Linear@M@@QAEXAAV0@@Z) referenced in function _main
2>D:\My_Documents\Project\C++\Hello\Debug\Hello.ex e : fatal error
LNK1120: 1 unresolved externals
Actually, I explicit declare the function in source cpp file. I don't
know what's the next I can do.
Thanks,
Ed.
