exceptions: reuse <stdexcept> classes???

This is a discussion on exceptions: reuse <stdexcept> classes??? within the C++ Programming forums, part of the General Programming Boards category; Is it a good idea to use classes defined in stdexcept (logic_error, runtime_error... etc). I think it should be. Basically, ...

  1. #1
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    exceptions: reuse <stdexcept> classes???

    Is it a good idea to use classes defined in stdexcept (logic_error, runtime_error... etc). I think it should be.

    Basically, I need to throw an exception with a printable message indicating a reason. I was wondering if I should write my own class for it or use logic_error or runtime_error of <stdexcept>.

    When thrown exception needs to be customized then it'd be a good idea to write a custom exception class. What do you think?

    Also, I'm getting a compile-time error when compiling this code:
    Code:
    string raison_str( "connect() failed, returned: " );
    raison_str += ret_code;
    raison_str += "WSAGetLastError() returned: ";
    raison_str += rcode;
          
    throw ( logic_error( raison_str ) );
    //      throw ( logic_error( string( "connect() failed." ) ) );
    The compiler (MSVC 6.0) gives following error:
    Code:
    C:\Ruchikar\RnD\wbsrvc1\Session.cpp(62) : error C2061: syntax error : identifier 'raison_str'
    C:\Ruchikar\RnD\wbsrvc1\Session.cpp(62) : error C2066: cast to function type is illegal
    C:\Ruchikar\RnD\wbsrvc1\Session.cpp(62) : error C2059: syntax error : ';'
    However, when I use the commented line, it works fine. What's wrong here... In both the cases there is a string object.

    Thanks in advance.
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    name="Ruchikar"
    quote="discussions are forgotten, only code remains"/>

  2. #2
    Just because ygfperson's Avatar
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    which line is line 62?

  3. #3
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    Originally posted by ygfperson
    which line is line 62?
    I think it start at the second line... or the first line...
    but hmmmmmmmmmmmm.,....
    what can I say.. ?
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  4. #4
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    Line 62 is:

    Code:
    throw ( logic_error( raison_str ) );
    <Signature
    name="Ruchikar"
    quote="discussions are forgotten, only code remains"/>

  5. #5
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    Re: exceptions: reuse <stdexcept> classes???

    Originally posted by Ruchikar

    Code:
    string raison_str( "connect() failed, returned: " );
    raison_str += ret_code;
    /*
    raison_str += "WSAGetLastError() returned: ";
    raison_str += rcode;
       */ // comment this all 
    throw ( logic_error( raison_str ) );
    //      throw ( logic_error( string( "connect() failed." ) ) );
    Have you try it like above.... ???

    I think the problem came from the first line not from the line 62 even if the error does show in 62
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  6. #6
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    Unhappy

    It still doesn't work. I commented all the three appends:
    Code:
    string raison_str( "connect() failed, returned: " );
    /*
    raison_str += ret_code;
    raison_str += "WSAGetLastError() returned: ";
    raison_str += rcode;
    */
    throw ( logic_error( raison_str ) );
    // throw ( logic_error( string( "connect() failed." ) ) );
    and the compilation still fails with same error.
    <Signature
    name="Ruchikar"
    quote="discussions are forgotten, only code remains"/>

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