To illustrate this argument, all we have to do is remove error checking from sample 2 - it will compile just fine and as long as there are no run time errors, it will work fine as well. However, imagine there was an error in the call to init(): the object client will be in invalid state and when its member functions are invoked, pretty much anything can happen depending on the internal implementation of the Socket class, Operating System, etc.; the program may crash immediately or it can even execute all the functions but do nothing and return without any sign that something went wrong - except for the result. On the other hand, if an exception was thrown from the constructor, the invalid object would have never even been constructed and the execution would continue at the exception handler. The usual phrase is: "we would get an exception right in our face".But is it really that hard to ignore an exception? Let's go up the stack and see the caller of get_html():Collapse | Copy Code// sample 4: "Swallowing exceptions"try { string html = get_html(url);}catch (...){}This horrible piece of code is known as "swallowing exceptions" and the effect is not much different than ignoring error codes. It does take more work to swallow exceptions than to ignore error codes and these constructs are easier to detect during code reviews, but the fact is that exceptions are still pretty easy to ignore, and people do it.However, even if they are easy to ignore, exceptions are easier to detect than error codes. On many platforms, it is possible to break when an exception is thrown if the process is run from a debugger. For instance, GNU gdb supports "catchpoints" for that purpose, and Windows debuggers support the option "break if an exception is thrown". It is much harder, if not impossible, to get a similar functionality with error codes. C++
Topic: Exceptions
Exceptions are hard to ignore, unlike error codes. ?
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