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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++3180, C++3181, C++3182 | ||||||||||||||
| 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) | |||||||||||||
| PVS-Studio |
| PRQA QA-C++ | ||||||||||||||
| Include Page |
| PRQA QA-C++
| 4032, 4035, 4631 V1061 | |||||||||||||
| SonarQube C/C++ Plugin |
| S3470 |
...