__declspec useage

 //   A global data item can normally be initialized only once in an EXE or DLL project. selectany can be used in initializing global data defined by headers,

// when the same header appears in more than one source file. that means you can instance one static variable in the .h.

 

// in file "CSeekMode.h"

class SeekMode
{
public:
 static SeekMode Begin;
 static SeekMode Current;
 static SeekMode End;
 operator int() const { return this->m_iValue; }
 bool operator == (const SeekMode& other) const { return this->m_iValue == other.m_iValue; }
 bool operator != (const SeekMode& other) const { return this->m_iValue == other.m_iValue; }

// Copy construction.
 SeekMode(const SeekMode& other = SeekMode::Begin) { this->m_iValue = other.m_iValue; }
private:
 SeekMode(int iValue) { this->m_iValue = iValue; }
 int m_iValue;
};
__declspec(selectany) SeekMode SeekMode::Begin(0);
__declspec(selectany) SeekMode SeekMode::Current(1);
__declspec(selectany) SeekMode SeekMode::End(2);

 

//