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assert.h is a header file in the C standard library. It defines the C preprocessor macro assert and implements runtime assertion in C. assert.h is defined in ANSI C as part of the C standard library. In the C++ programming language, assert.h and < cassert > are available; both are functionally equivalent. [1]
Making the text message for static_assert optional [5] Allow typename (as an alternative to class) in a template template parameter [6] New rules for auto deduction from braced-init-list [7] [8] Nested namespace definitions, e.g., namespace X:: Y {…} instead of namespace X {namespace Y {…}} [8] [9] Allowing attributes for namespaces and ...
Unevaluated strings; Adding @, $, and ` to the basic character set; constexpr cast from void*; User-generated static_assert messages; Placeholder variables with no name; Pack indexing
The new utility introduces a new way to test assertions at compile-time, using the new keyword static_assert. The declaration assumes this form: static_assert (constant-expression, error-message); Here are some examples of how static_assert can be used:
The C++ Standard Library provides several generic containers, functions to use and manipulate these containers, function objects, generic strings and streams (including interactive and file I/O), support for some language features, and functions for common tasks such as finding the square root of a number.
The C standard library, sometimes referred to as libc, [1] is the standard library for the C programming language, as specified in the ISO C standard. [2] Starting from the original ANSI C standard, it was developed at the same time as the C POSIX library, which is a superset of it. [3]
C++23, formally ISO/IEC 14882:2024 [1], is the current open standard for the C++ programming language that follows C++20.The final draft of this version is N4950. [2] [3]In February 2020, at the final meeting for C++20 in Prague, an overall plan for C++23 was adopted: [4] [5] planned features for C++23 were library support for coroutines, a modular standard library, executors, and networking.
In these cases, documenting all such assumptions in comments, and introducing static assertions to verify portability expectations, helps to keep the code maintainable. Practical examples of floating-point punning include fast inverse square root popularized by Quake III , fast FP comparison as integers, [ 1 ] and finding neighboring values by ...