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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 are available; both are functionally equivalent.


      Use


      The assert macro implements runtime assertion. If the expression within it is false, the macro will print a message to stderr and call abort(), defined in stdlib.h. The message includes the source filename and the source line number from the macros __FILE__ and __LINE__, respectively. Since C99, the name of the function the assert statement is included as (__FUNC__) and the expression itself. In ANSI C, the expression in the assert macro is defined as signed integer, although any expression that can be implicitly cast to a signed integer may be used. In C99, the assert macro explicitly allows any scalar type. Two common uses of the assert macro are to assert that a pointer is not null and to ensure that an array index is in-bounds.
      Below is a program using the assert macro. This program will always evaluate pointer as false, as pointer is a null pointer and does not point to a valid memory location:

      Upon compiling the program and running it, a message similar to the following will be output:

      The definition of the assert macro changes depending on the definition of another macro, NDEBUG. If NDEBUG is defined as a macro name, the assert macro is defined as #define assert(ignore) ((void)0), thus resulting in the macro not evaluating the expression. The use of NDEBUG may affect the overall behavior of a program if one or more assert statements contain side effects, as these statements are not evaluated.
      The assert macro does not include an error message. However the comma operator can be used to add it to the printed expression, as in assert(("Not Orwellian", 2 + 2

      5));.

      = static_assert ===
      The static_assert macro, added in C++11, serves a similar purpose to the assert macro. Unlike the assert macro, static_assert runs at compile-time rather than at runtime. The original implementation used template hacks. The static_assert macro takes in a constant expression that can be converted into a Boolean and a string literal; if the expression fails, the string literal is returned, otherwise, the macro has no effect. In C++17, this assertion failure message was made optional, and the subsequent message is omitted if not specified.
      In C11, the functionally equivalent declaration _Static_assert was added. assert.h defines static_assert as an alias for _Static_assert to ensure parity with C++. In C23, _Static_assert was renamed to static_assert and the string literal argument was made optional. Gnulib defines static_assert for platforms that do not use C11 and does not require assert.h to be included.


      References




      = Citations

      =


      = Bibliography

      =
      American National Standards Institute (1990). Rationale for the ANSI C Programming Language. Summit: Silicon Press. ISBN 9780929306070.
      Ballman, Aaron; Grammatech (July 6, 2018). Harmonizing static_assert with C++ (Report).
      Binder, Robert (2000). Testing Object-oriented Systems: Models, Patterns, and Tools (2nd ed.). Boston: Addison-Wesley. ISBN 9780201809381.
      Gregoire, Marc (2021). Professional C++ (5th ed.). Hoboken: Wiley. ISBN 9781119695455.
      Gustedt, Jens (February 15, 2022). Revise spelling of keywords (Report).
      Kernighan, Brian; Ritchie, Dennis (1988). The C Programming Language (2nd ed.). Hoboken: Prentice Hall. ISBN 9780131103627.
      Lischner, Ray (2009). C++ In a Nutshell: A Desktop Quick Reference (2nd ed.). Sebastopol: O'Reilly Media. ISBN 9781449378837.
      ISO/IEC JTC 1/SC 22/WG14 (December 1999). ISO/IEC 9899:1999 (Report).{{cite report}}: CS1 maint: numeric names: authors list (link)
      ISO/IEC JTC 1/SC 22/WG21 (January 2012). ISO/IEC 14882:2011 (Report).{{cite report}}: CS1 maint: numeric names: authors list (link)
      Prata, Stephen (2013). C Primer Plus (6th ed.). London: Pearson Education. ISBN 9780133432381.
      Swaminathan, Jeganathan (2017). Mastering C++ Programming. Birmingham: Packt. ISBN 9781786461629.

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    assert.h - Wikipedia

    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.

    assert - cppreference.com

    Dec 4, 2024 · assert puts a diagnostic test into programs and expands to an expression of type void. __VA_ARGS__ is evaluated and contextually converted to bool: If the evaluation yields true, there are no further effects. Otherwise, assert creates a diagnostic on the standard error stream and calls std::abort ().

    C Library - <assert.h> - Online Tutorials Library

    The assert.h header file of the C Standard Library provides a macro called assert which can be used to verify assumptions made by the program and print a diagnostic message if this assumption is false.

    C 标准库 - <assert.h> - 菜鸟教程

    assert.h 标准库主要用于在程序运行时进行断言断言是一种用于测试假设的手段，通常用于调试阶段，以便在程序出现不符合预期的状态时立即发现问题。 <assert.h> 提供的断言机制是 C 语言中一个有用的工具，帮助开发人员在早期发现和修复程序中的错误。 已定义的宏 assert 指向另一个宏 NDEBUG，宏 NDEBUG 不是 <assert.h> 的一部分。 如果已在引用 <assert.h> 的源文件 …

    C Programming/assert.h - Wikibooks, open books for an open world

    Apr 16, 2020 · assert.h defines the macro assert. The macro can be used to verify assumptions made by the program and print a diagnostic message if this assumption is false. When executed, if the expression is false (that is, compares equal to 0), assert writes information about the call that failed on stderr and then calls abort().

    assert.h - verify program assertion - Open Group

    The <assert.h> header shall define the assert macro. It refers to the macro NDEBUG which is not defined in the header. If NDEBUG is defined as a macro name before the inclusion of this header, the assert macro shall be defined simply as: #define assert(ignore)((void) 0) Otherwise, the macro behaves as described in assert.

    <cassert> (assert.h) - C++ Users

    assert.h defines one macro function that can be used as a standard debugging tool: Macro functions assert Evaluate assertion (macro)

    C++ assert implementation in assert.h - Stack Overflow

    Mar 14, 2012 · __assert is an internal function that will presumably print a message and implement the required assertion behaviour (i.e. call abort()). Almost... Consider: assert( a == 0 ); This is expanded to.

    Using Assert.h in C - OpenGenus IQ

    In this article we'll talk about one of those header files, namely the assert.h header file. First we'll look at the purpose of this file, second we'll go over code examples and in the third part we'll dive a little deeper into the details of this header file and tips on how to use it.

    C Language: Standard Library Functions - assert.h - TechOnTheNet

    In the C Programming Language, the Standard Library Functions are divided into several header files. The following is a list of functions found within the <assert.h> header file: