???????????????????????????????C++??????????????????????????????????????????????????????????C/C++????????????(??????????????????????)???????????1/3???????????????1/3?????????????????????????????б??????Щ?????????￡??????????(???????????????VS??GCC?????????????????????????????????÷?Χ???)
????C/C++????????????????????????????pass by value??????????pass bypointer????????????pass by reference????
????C/C++???????????????????????????????????__cdecl(C???????)?????????????????????????????????????????????????????????????(Win32API???stdcall???ι淶???????????????Χ)
????????????????

 

void Swap(__int64* _pnX?? __int64* _pnY)
{
__int64 nTemp = *_pnX;
*_pnX = *_pnY;
*_pnY = nTemp;
}
void Swap(__int64& _nX?? __int64& _nY)
{
__int64 nTemp = _nX;
_nX = _nY;
_nY = nTemp;
}
void SetValue(__int64 _nX)
{
__int64 nTemp = _nX;
}
// Test001
void GetMemory(__int64* _pBuff)
{
_pBuff = new __int64[4];
}
// Test002
void GetMemory(__int64** _ppBuff)
{
*_ppBuff = new __int64[4];
}
int _tmain(int argc?? _TCHAR* argv[])
{
__int64 nA = 0x10;
__int64 nB = 0x20;
// Test to pass by pointer
Swap(&nA?? &nB);
// Test to pass by reference
Swap(nA?? nB);
// Test to pass by value
SetValue(nA);
// Test the pointer that points the pointer
__int64* _pArray = NULL;
GetMemory(&_pArray);
delete[] _pArray;
_pArray = NULL;
// Test the pointer
GetMemory(_pArray);
return 0;
}

?????????????????

 

// ???濴???????????????(VS?棩
__int64 nA = 0x10;
0041370E  mov         dword ptr [nA]??10h
00413715  mov         dword ptr [ebp-8]??0
__int64 nB = 0x20;
0041371C  mov         dword ptr [nB]??20h
00413723  mov         dword ptr [ebp-18h]??0
// Test to pass by pointer
Swap(&nA?? &nB);
0041372A  lea         eax??[nB]
0041372D  push        eax
0041372E  lea         ecx??[nA]
00413731  push        ecx
00413732  call        Swap (4111E5h)
00413737  add         esp??8
// Test to pass by reference
Swap(nA?? nB);
0041373A  lea         eax??[nB]
0041373D  push        eax
0041373E  lea         ecx??[nA]
00413741  push        ecx
00413742  call        Swap (4111E0h)
00413747  add         esp??8
// GCC??
0x00401582 <+30>:    lea    eax??[esp+0x18]
0x00401586 <+34>:    mov    DWORD PTR [esp+0x4]??eax
0x0040158a <+38>:    lea    eax??[esp+0x1c]
0x0040158e <+42>:    mov    DWORD PTR [esp]??eax
0x00401591 <+45>:    call   0x401520 <Swap(int*?? int*)>
0x00401596 <+50>:    lea    eax??[esp+0x18]
0x0040159a <+54>:    mov    DWORD PTR [esp+0x4]??eax
0x0040159e <+58>:    lea    eax??[esp+0x1c]
0x004015a2 <+62>:    mov    DWORD PTR [esp]??eax
0x004015a5 <+65>:    call   0x401542 <Swap(int&?? int&)>