Template class specialization in seperate .cpp file-CodePudding

I have the following template class specializations in foo.h:

using VisionMethod = enum
{
    TemplateMatching,
    ...
};

template <VisionMethod>
class Foo
{
    Foo() = delete;
};

template <>
class Foo<TemplateMatching>
{
public:
    static void get_pose();
};

and wish to implement it in foo.cpp as:

#include "foo.h"

void
Foo<TemplateMatching>::get_pose()
{
    std::cout << "Using foo<TemplateMatching>::get_pose()...\n";
}

But I (somewhat understandably) get a linker error when I try to call foo<TemplateMatching>::get_pose() in e.g. main.cpp after only including foo.h. Can I achieve what I want, without having to include foo.cpp in either foo.h or main.cpp - maybe using explicit instantiation? Or is something like foo.txx my only "clean" solution?

CodePudding user response：

You need to define your specialized function (i.e what you put in foo.cpp) in foo.h in order to use it in main.cpp

CodePudding user response：

what you proposed already works (after add #include <iostream>), you probably forget to tell the compiler to include foo.cpp.

like g main.cpp foo.cpp

https://wandbox.org/permlink/LDpxhgeYPkakWFwE