Thread: sync_with_stdio() error

This code (included in all of my source files):

Code:

//External links/includes

#ifndef XOR_LIBRARIES_HEADER
#define XOR_LIBRARIES_HEADER

#define WIN_32_LEAN_AND_MEAN

#include <iostream>
#include <fstream>
#include <cstdlib> //rand(), system()
#include <ctime> //used for random seed
#include <windows.h> //ShellExecute()

std::ios::sync_with_stdio(false);  //a bit of optimization, because I don't use C i/o streams        

#endif

Is generating these errors:

Code:

std::ios::sync_with_stdio(false);
error: expected `,' or `;' before '(' token  
error: expected constructor, destructor, or type conversion before '(' token

You can't have a function call at that scope.

If you're not sure what you're doing or why, maybe that should be the question.

Then the question is: within which source file should I call the function?

How about this first?

Code:

std::ios::sync_with_stdio(false);  //a bit of optimization, because I don't use C i/o streams

If you are not using C I/O streams, then why -- as an "optimization" -- are you trying to synchronize with them?

[edit]

Originally Posted by CodeMonkey

Then the question is: within which source file should I call the function?

http://www.dinkumware.com/manuals/?m...ync_with_stdio

I'm "desynchronizing" to allow cout to be fully buffered, so it performs better.
>>You can call it reliably only before performing any operations on the standard streams.
Yes, but apparently not in the header scope. How can I ensure... oh, I'll just put it before main(). Der. Thanks.

Originally Posted by CodeMonkey

oh, I'll just put it before main(). Der. Thanks.

Okay, you really ought to understand better what you're doing first.

I'd also recommend checking the return value to verify you didn't go through the effort to change false to false.

Originally Posted by CodeMonkey

I'm "desynchronizing" to allow cout to be fully buffered, so it performs better.

That suspiciously sounds like a new form of premature optimization that I had not heard of before.

So profiling your program indicated that there is a bottleneck in the standard C++ I/O streams?

http://gcc.gnu.org/onlinedocs/libstd...o/howto.html#8

Originally Posted by Dave_Sinkula

That suspiciously sounds like a new form of premature optimization that I had not heard of before.

So profiling your program indicated that there is a bottleneck in the standard C++ I/O streams?

As I suspected, I presume.
http://www.daniweb.com/techtalkforums/post39209-6.html

*sigh* I stand corrected. Thanks for the advice.