C / C++ / MFC

'symbol' : ambiguous symbol<br />
<br />
The compiler cannot determine which symbol you are referring to.<br />
<br />
The following sample generates C2872:<br />
<br />
// C2872.cpp<br />
namespace A<br />
{<br />
   int i;<br />
}<br />
<br />
using namespace A;<br />
int i;<br />
void z()<br />
{<br />
   ::i++;   // ok<br />
   A::i++;   // ok<br />
   i++;   // C2872, ::i or A::i?<br />
}<br />

open CDaudio alias cd sharable wait
set cd door locked wait
close cd wait

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

if(x & (x-1))
{
    // Number is not a power of two
}
else
{
    // Number is a power of two
}

BOOL bRet;
MSG msg;
while((bRet = GetMessage(&msg, NULL, 0, 0)) != 0)
{ 
    if (bRet == -1)
    {
        // handle the error and possibly exit
    }
    else
    {
        TranslateMessage(&msg); 
        DispatchMessage(&msg); 
    }
}