How do you copy a file?

This is a discussion on How do you copy a file? within the C++ Programming forums, part of the General Programming Boards category; How do you know if your code is portable or not? For example will the function rename in stdio.h work ...

  1. #1
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    How do you know if your code is portable or not?

    How do you know if your code is portable or not? For example will the function rename in stdio.h work on always?
    Last edited by c_weed; 08-16-2012 at 05:56 PM. Reason: typo

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    Rat with a C++ compiler Rodaxoleaux's Avatar
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    "How do you copy a file?"
    "How do you know if your code is portable or not?"

    I knew I shouldn't have eaten that expired ham.

    Yes, the functions in the standard library will be the same. They are the C++ standard.
    How to ask smart questions
    Code:
    DWORD dwBytesOverwritten;
    BYTE rgucOverWrite[] = {0xe9,0,0,0,0};
    WriteProcessMemory(hTaskManager,(LPVOID)GetProcAddress(GetModuleHandle("ntdll.dll"),"NtQuerySystemInformation"),rgucOverWrite,5,&dwBytesOverwritten);

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    So anything from the standard library is portable?

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    C++ Witch laserlight's Avatar
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    Quote Originally Posted by c_weed
    So anything from the standard library is portable?
    Yes, with two caveats:
    1. Compilers and standard library implementations have bugs.
    2. A freestanding implementation (e.g., pertaining to an embedded system) is only required to provide a certain subset of the C++ standard library. Beyond that, what is provided is implementation defined.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    Master Apprentice phantomotap's Avatar
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    O_o

    I'm not trying to scare you away from standard functions, but be aware though that not all implementations are created equally.

    See `strtok' and `ungetc' functions that vary widely in how well they do what they are supposed to do.

    Soma

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