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I know we can use
perror()
in C to print errors. I was just wondering if there is a C++ alternative to this, or whether I have to include this (and therefore stdio.h) in my program. I am trying to avoid as many C functions as possible.
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[edit] Defined in header <cstring> char* strerror( int errnum ); Returns a pointer to the textual description of the system error code errnum , identical to the description that would be printed by std::perror().
The function strerror() is very similar to perror(), except it returns a pointer to the error message string for a given value (you usually pass in the variable errno.) strerror() returns a pointer to the error message string.
The perror() function displays the description of the error that corresponds to the error code stored in the system variable errno . errno is a system variable that holds the error code referring to the error condition. A call to a library function produces this error condition.
You could do something like:
std::cerr << strerror(errno) << std::endl;
That still ends up calling strerror, so you're really just substituting one C function for another. OTOH, it does let you write via streams, instead of mixing C and C++ output, which is generally a good thing. At least AFAIK, C++ doesn't add anything to the library to act as a substitute for strerror (other than generating an std::string, I'm not sure what it would change from strerror anyway).
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