CERT C++: DCL58-CPP

Do not modify the standard namespaces

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Description

Rule Definition

Do not modify the standard namespaces.¹

Polyspace Implementation

The rule checker checks for Modification of standard namespaces.

Examples

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Modification of standard namespaces

Issue

Modification of standard namespaces occurs when you make additions to the namespaces std, posix, or their subspaces, or you specialize class or function templates from these namespaces.

Risk

Adding declarations or definitions to namespace std or its subspaces, or to posix or its subspaces, leads to undefined behavior. Likewise, explicitly specializing a member function or member class of a standard library leads to undefined behavior.

The standard allows exceptions to the specialization aspect of the rule for standard library templates that require a user-defined type. If you have a process that all rule violations must be justified and an issue flagged by the checker belongs to this category of exceptions, justify the issue using comments in your result or code. See:

Address Results in Polyspace User Interface Through Bug Fixes or Justifications if you review results in the Polyspace user interface.
Address Results in Polyspace Access Through Bug Fixes or Justifications (Polyspace Access) if you review results in a web browser.
Annotate Code and Hide Known or Acceptable Results if you review results in an IDE.

Check Information

Group: 01. Declarations and Initialization (DCL)

Version History

Introduced in R2019b

¹ This software has been created by MathWorks incorporating portions of: the “SEI CERT-C Website,” © 2017 Carnegie Mellon University, the SEI CERT-C++ Web site © 2017 Carnegie Mellon University, ”SEI CERT C Coding Standard – Rules for Developing safe, Reliable and Secure systems – 2016 Edition,” © 2016 Carnegie Mellon University, and “SEI CERT C++ Coding Standard – Rules for Developing safe, Reliable and Secure systems in C++ – 2016 Edition” © 2016 Carnegie Mellon University, with special permission from its Software Engineering Institute.

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