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C++ Error Handling Without Exceptions
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to: Instapaper Pocket Readability Exceptions and Error Handling Why use exceptions? What good can using exceptions do for me? The basic answer is: Using exceptions for error handling makes your code simpler, cleaner, and less likely to https://msdn.microsoft.com/en-us/library/ms973849.aspx miss errors. But what's wrong with "good old errno and if-statements"? The basic answer is: Using those, your error handling and your normal code are closely intertwined. That way, your code gets messy and it becomes hard to ensure that you have dealt with all errors (think "spaghetti code" or a "rat's nest of tests"). First of all there are things that just can't be done right without exceptions. Consider an error detected https://isocpp.org/wiki/faq/exceptions in a constructor; how do you report the error? You throw an exception. That's the basis of RAII (Resource Acquisition Is Initialization), which is the basis of some of the most effective modern C++ design techniques: A constructor's job is to establish the invariants for the class (create the environment in which the member functions are to run) and that often requires the acquisition of resources, such as memory, locks, files, sockets, etc. Imagine that we did not have exceptions, how would you deal with an error detected in a constructor? Remember that constructors are often invoked to initialize/construct objects in variables: vector
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> inputs = list(1, 2, 4, -5, 'oops', 0, 10) > for(input in inputs) { + print(paste("log of", input, "=", log(input))) + } [1] "log of 1 = 0" [1] "log of 2 = 0.693147180559945" [1] "log of 4 = 1.38629436111989" [1] "log of -5 = NaN" Error in log(input) : Non-numeric argument to mathematical function In addition: Warning message: In log(input) : NaNs produced
The loop handled the negative arguments more or
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