Inline Definitions and Declarations?

Hey programmers of C Board :)
I have a question about inline functions. If I declare a function inline, do I have to define it as inline also? I'll demonstrate:

SomeHeader.h

Code:

---

class Someclass
{
public:
    inline void vSomeFunc();
};

---

...and in my .cpp file I have:

SomeCppFile.cpp

Code:

---

inline void SomeClass::vSomeFunc()
{
    std::cout << "Some output" << std::endl;
}

---

... so in my source file, do I need to define the function vSomeFunc as inline if I have already declared it as inline?

1) The compiler needs to see the definition of an inline function. You need to put the implementation into the header file.

2) Once a function is declared inline once, it sticks. Redeclarations won't change that. Declare a function first non-inline and then inline, however, and it becomes inline. Define a function non-inline, and then declare it inline, and the program is ill-formed, as per Core Issue 317.