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:

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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." ) ) );

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The compiler (MSVC 6.0) gives following error:

Code:

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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 : ';'

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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.

which line is line 62?

Quote:

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Originally posted by ygfperson
which line is line 62?

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I think it start at the second line... or the first line...
but hmmmmmmmmmmmm.,....
what can I say.. ?

Line 62 is:

Code:

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throw ( logic_error( raison_str ) );

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Quote:

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Originally posted by Ruchikar

Code:

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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." ) ) );

---

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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

It still doesn't work. I commented all the three appends:

Code:

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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." ) ) );

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and the compilation still fails with same error.