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Defining an unnamed namespace within a header file can cause data integrity violations and performance problems but is unlikely to go unnoticed with sufficient testing. One-definition rule violations result in undefined behavior.
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
DCL59-CPP | Medium | Unlikely | Medium | P4 | L3 |
Automated Detection
Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Astrée |
| unnamed-namespace-header | Fully checked | ||||||
| Axivion Bauhaus Suite |
| CertC++-DCL59 | |||||||
| Clang |
| cert-dcl59-cpp | Checked by clang-tidy | ||||||
| CodeSonar |
| LANG.STRUCT.DECL.ANH | Anonymous Namespace in Header File | ||||||
| Helix QAC |
| C++2518 | |||||||
| Klocwork |
| MISRA.NAMESPACE.UNMD | |||||||
| LDRA tool suite |
| 286 S, 512 S | Fully implemented | ||||||
| Parasoft C/C++test |
| CERT_CPP-DCL59-a | There shall be no unnamed namespaces in header files | |||||||
| Polyspace Bug Finder |
| CERT C++: DCL59-CPP | Checks for unnamed namespaces in header files (rule fully covered) | ||||||
| RuleChecker |
| unnamed-namespace-header | Fully checked | ||||||
| SonarQube C/C++ Plugin |
| UnnamedNamespaceInHeader |
| PVS-Studio |
| V1068 |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Related Guidelines
Bibliography
| [ISO/IEC 14882-2014] | Subclause 3.2, "One Definition Rule" |
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