ostream problem...

This is a discussion on ostream problem... within the C++ Programming forums, part of the General Programming Boards category; my code requirement is that a string between two macros is to be displayed at the console. Like this: Code: ...

  1. #1
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    Question ostream problem...

    my code requirement is that a string between two macros is to be displayed at the console. Like this:
    Code:
    TRACE << "hello world" << ENDTRACE;
    Question is: how should the two MACROS be defined.

    I am thinking of TRACE expanding to a static ostream object whose inserter can be overloaded to display the string at the console. What do you think?

    Any ideas would be helpful.

    TIA
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  2. #2
    End Of Line Hammer's Avatar
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    Code:
    #include <iostream.h>
    
    #define TRACE cout
    #define ENDTRACE endl
    
    int main(void)
    {
        TRACE << "hello world" << ENDTRACE;
    }
    It's a bit poor really, but it works.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
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    Talking

    well, for the given problem that's probably the simplest and best solution.

    But I didn't specify the problem in detail The reason I said console was because that was what I was trying to do in a test program.

    Ok, so the problem is: I need to invoke a method passing on the string between the two MARCOS. Something like:
    Code:
    TRACE << "The number is: " << some_method_returning_int() << ENDTRACE;
    if some_method_returning_int() returned: 5, the effect of macro expansion should be:
    Code:
    someObj::trace_to_correct_channel( "The number is: 5" );
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  4. #4
    S Sang-drax's Avatar
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    A solution to your problem would be:
    Code:
    #define TRACE {stringstream __a;__a
    #define ENDTRACE "";someObj::trace_to_correct_channel(__a.str().c_str());}
    I do not recommend use of macros like this, though.

    (Edit) Don't forget to #include <sstream>
    Last edited by Sang-drax; 10-18-2002 at 11:56 AM.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

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