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"It's far more readable and — as a bonus — compiler is likely to produce more efficient code." I want to learn more about this, when or how do you know a compi

• narrowtux 8y ago
  The example int rc = fx (); if (rc != 0) handle_error (); can be simply converted into ASM ; call fx() and copy to acc JNZ handle_error ; rest of code handle_error: ; code of handle_error() whereas exceptions in C++ need to generate a lot more code than this
  • mhh__ 8y ago
    The C++ code can be compiled in such a way that it has no branching e.g. stack unwinding instead, which is slower in the case of an exception being thrown - However, exceptions shouldn't be used for non-exceptional circumstances.
• cptwunderlich 8y ago
  Well, I think most people do it by some sort of "trial and error", the tool of choise is Matt Godbolt's Compiler Explorer [1] I sometimes listen to the CppCast Podcast and one of the Hosts, Jason Turner, likes to write code in modern C++ for some vintage computers. He tests code bits in Compiler Explorer for that. He also has a YouTube Channel where he does that [2] [1] https://gcc.godbolt.org/ https://gcc.godbolt.org/ [2] https://www.youtube.com/user/lefticus1 https://www.youtube.com/user/lefticus1
• mhh__ 8y ago
  You profile the generated code, be that in terms of execution speed or size in bytes: If it's better then it's better. In this case C++ exceptions are practically zero cost so I don't quite believe that the compiler will generate more efficient code unless it elides some of the C version based on context (Otherwise the if statements aren't free)