CODEWITHSUNDEEP
c++visual-c++inlining
Bob Bobby
Bob Bobby

Reputation: 134

__forceinline and inline usage

When using __forceinline or inline inside of a class do I have to include the definition inside of the header file in MSVC? I've heard mixed opinions on this that vary through different compilers.

Example 1: 

//some_class.hpp
class some_class
{
public:
   __forceinline void some_function();
   inline void other_function();
};

//some_class.cpp
void some_class::some_function() { }
void some_class::other_function() { }

Example 2:

//some_class.hpp
class some_class
{
public:
   __forceinline void some_function() { }
   inline void other_function() { }
};

Upvotes: 1

Views: 2670

Answers (1)

user7860670
user7860670

Reputation: 37599

In MSVC leaving function definition in .cpp file causes unresolved external symbol error when linking if function was previously explicitly declared as inline, __inline or __forceinline. So I guess one must put function definition into header. Which makes sense because in order to actually inline the function it's body must be available for compiler.

Upvotes: 1

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