Assertions (run-time checks of a Boolean condition) have been around since the beginnings of the C language, and are of course available to C++ from the <cassert> header. Starting with the latest Standard, C++ supports a more flexible and featured approach to assertions, with the new language keywords pre, post and contract_assert. This article is intended to provide a walkthrough and quick-start to using these keywords in Modern C++ code, and hopefully explains some of the aims and rationale behind their names and functionality.
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Learn Modern C++ 