Category Archives: programming

as the name implies…

Your own type predicate

In this post we will see how to define a type trait or a type predicate or a meta-function that would allow us to check at compile time whether a type exposes an interface that we need. That is, we … Continue reading

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error codes — some clarifications

In this post I would like to discuss two issues brought up by the readers regarding previous posts on using <system_error>: Storing 0 in error codes, and using non-0 success values. Concerns about using globals.

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Using error codes effectively

In the previous posts we have seen what error codes and error conditions are. But the way we used them is far from optimum. In particular, the implementation of FailureSourceCategory::equivalent was huge and error category FailureSourceCategory was forced to be … Continue reading

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Your own error condition

In the previous post we have seen how you can create your own error-code enumeration for representing different reasons for failure in your component, and how you can store them and convey them type erased via std::error_code. In this post … Continue reading

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Your own error code

I was recently implementing the “classification of error conditions” in my application offered by the functionality behind std::error_code. In this post I want to share some of my experience and insight. C++11 comes with a quite sophisticated mechanism for classifying … Continue reading

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Compile-time string concatenation

We will start with a bug, taken from real life. It spans across three files: Question: what happens when this program is executed?

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Asserts in constexpr functions

Assertions (like C-style macro assert) are not an ideal, but still useful tool for indicating assumptions about program correctness, and help finding programmer bugs. In this post we will see how we can use assertions in constexpr functions. This works … Continue reading

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