Tag Archives: gotchas

String literals make bad ranges

Posted on September 25, 2019 by Andrzej Krzemieński

C++20 will come with what we call “Ranges” library. Meanwhile, range interface has been supported ever since C++11 in one context: range-based for loop. A range-based for loop can detect anything that is a range and work with it. In … Continue reading →

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Deducing your intentions

Posted on December 9, 2018 by Andrzej Krzemieński

The language feature in C++17 known as class template argument deduction was intended to supersede factory functions like make_pair, make_tuple, make_optional, as described in p0091r2. This goal has not been fully achieved and we may still need to stick to … Continue reading →

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Faces of undefined behavior

Posted on October 27, 2018 by Andrzej Krzemieński

I have been busy recently (doing C++-related stuff) and cannot find a spare time for preparing a decent blog post. I expect that to change in November. For the interim I am posting here my last year’s talk at code::dive: … Continue reading →

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Functions in std

Posted on July 7, 2018 by Andrzej Krzemieński

Names of functions from the Standard Library used as pointers/references to functions can cause breakage in your code if you are upgrading to the newer version of C++ or compiling using a different implementation of the Standard Library, or even … Continue reading →

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String’s competing constructors

Posted on March 12, 2018 by Andrzej Krzemieński

Let’s start with the problem. I want to check whether a program received a text message that consists of four consecutive zeroes. Not ‘0’, but the numeric zero. I will create a constant std::string representing the special sequence and compare … Continue reading →

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error codes — some clarifications

Posted on October 14, 2017 by Andrzej Krzemieński

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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The GCC bug affects you

Posted on May 5, 2017 by Andrzej Krzemieński

This is a follow-up to my previous post about a bug in GCC. I was reading comments, and observed that some readers say that the example I used is rare, or artificial, or that it does not follow “good programming … Continue reading →

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A serious bug in GCC

Posted on April 27, 2017 by Andrzej Krzemieński

This post is to inform you about a bug in GCC that may cause memory (or other resource) leaks in your valid C++ programs.

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(Not) detecting bugs

Posted on January 2, 2017 by Andrzej Krzemieński

The following code contains a bug. A developer has spent quite some time looking for the source. The intent of this code is to iterate over two vectors simultaneously, from the first up to the one-before-last element. Thus the most … Continue reading →

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