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| Code Block |
|---|
namespace MyNamespace {
int ilength;
}
namespace MyNamespace {
int iwidth;
}
void f() {
MyNamespace::ilength = MyNamespace::iwidth = 12;
} |
The standard library introduces the namespace std for standards-provided declarations such as std::string, std::vector, and std::for_each. However, it is undefined behavior to introduce new declarations in namespace std except under special circumstances. The C++ Standard, [namespace.std], paragraphs 1 and 2 [ISO/IEC 14882-2014], states the following:
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Tool | Version | Checker | Description | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Axivion Bauhaus Suite |
| CertC++-DCL58 | ||||||||||||
| CodeSonar |
| LANG.STRUCT.DECL.SNM | Modification of Standard Namespaces | |||||||||||
| Helix QAC |
| C++40323180, C++40353181, C++46313182 | ||||||||||||
| Klocwork |
| CERT.DCL.STD_NS_MODIFIED | ||||||||||||
| Parasoft C/C++test |
| CERT_CPP-DCL58-a | Do not modify the standard namespaces 'std' and 'posix' | |||||||||||
| Polyspace Bug Finder |
| CERT C++: DCL58-CPP | Checks for modification of standard namespaces (rule fully covered) | PRQA QA-C++ | ||||||||||
| Include Page | PRQA QA-C++_V | PRQA QA-C++_V | 4032, 4035, 4631||||||||||||
| PVS-Studio |
| V1061 | ||||||||||||
| SonarQube C/C++ Plugin |
| S3470 |
...