构造函数 Vector2(const Real afCoordinate[2]) 和 Vector2(Real* const r)
class _OgreExport Vector2 { public: Real x, y; public: inline explicit Vector2( const Real afCoordinate[2] ) : x( afCoordinate[0] ), y( afCoordinate[1] ) { } inline explicit Vector2( Real* const r ) : x( r[0] ), y( r[1] ) { } };