I'm attempting to wrap a templated class method. Linking fails with unresolved external symbols if the function definition appears in the *.cpp file. If I put the function definition in the *.h file, the code compiles successfully. This ...
}; //.cpp template <class T> void foo<T>::bar(const T &t) { } // Explicit template instantiation template class foo<int>; Ref C++ Templates: 总结的很完备了 Storing C++ template function definitions in a .CPP file: 文件隔离的各种可能性版权...
You need to use theexportkeyword. However, I don't think G++ has proper support, so you need to include the template function's definition in
Explicit instantiation definition of a function template with default arguments is not a use of the arguments, and does not attempt to initialize them: char* p = 0; template<class T> T g(T x = &p) { return x; } template int g<int>(int); // OK even though &p isn’t an int....
A function template by itself is not a type, or a function, or any other entity. No code is generated from a source file that contains only template definitions. In order for any code to appear, a template must be instantiated: the template arguments must be determined so that the ...
Don't separate out template definitions into their own implementation file. The reason for this is that the compiler must know the full definition of the template in order to generate a function. In other words, move the contents of util.cpp into util.h, and delete util.cpp. More details...
* A sample class template function definition */ template <typename T> void Sample_World<T>:: show_val(){ cout<<"from show_val function x: "<<x<<endl; } binding.cpp #include <pybind11/pybind11.h> #include "sample_temp.h"
//MAIN.CPP #include "B.H" void main() { b<int> bi ; b <float> bf ; } When compiling B.cpp, the compiler has both the declarations and the definitions available. At this point the compiler does not need to generate any definitions for template classes, since there are no instantiati...
template.cpp myTemplate<int> myTemplate<float> Sep 12, 2009 at 6:31am Bazzy(6281) Actually, C++ allows templates to be defined in a separated sourcefile by using theexportkeyword Unfortunately C++ compilers usually don't support this feature:http://en.wikipedia.org/wiki/Export_%28C%2B%2B...
template<>X Q<int>::x;// declaration of a static membertemplate<>X Q<int>::x();// error: function declarationtemplate<>X Q<int>::x{};// definition of a default-initialized static member A member or a member template of a class template may be explicitly specialized for a given im...