Trying to put this into one line

[DangerMonkey69]

Okay so I'm reading bytes from an array in memory like so:

int ReadInt()
{
unsigned char data[4] = { _Buffer[_Index++], _Buffer[_Index++], _Buffer[_Index++], _Buffer[_Index++] };
return data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
}

Now this works great, but normally in C# I can do this in one line without creating a data array like this:

return ( _Buffer[_Index++] << 24 ) | ( _Buffer[_Index++] << 16 ) | ( _Buffer[_Index++] << 8 ) | _Buffer[_Index++];

When I try this in C++, I get unexpected results.

Any thoughts on why it does not work this way? My best guess is that it has to do with order of operations, but I tried adding some parenthesis in different places with no luck.

[firedraco]

unsigned char data[4] = { _Buffer[_Index++], _Buffer[_Index++], _Buffer[_Index++], _Buffer[_Index++] };

This line is undefined anyways since you are accessing modifying Index multiple times in between a sequence point. The order in which function arguments are evaluated is undefined.

[DangerMonkey69]

I'm sorry, but I'm not sure what you are talking about. It works fine I'm just trying to put it into one line.