| .. title:: clang-tidy - cppcoreguidelines-avoid-non-const-global-variables |
| |
| cppcoreguidelines-avoid-non-const-global-variables |
| ================================================== |
| |
| Finds non-const global variables as described in `I.2 of C++ Core Guidelines <https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Ri-global>`_ . |
| As `R.6 of C++ Core Guidelines <https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Rr-global>`_ is a duplicate of rule I.2 it also covers that rule. |
| |
| .. code-block:: c++ |
| |
| char a; // Warns! |
| const char b = 0; |
| |
| namespace some_namespace |
| { |
| char c; // Warns! |
| const char d = 0; |
| } |
| |
| char * c_ptr1 = &some_namespace::c; // Warns! |
| char *const c_const_ptr = &some_namespace::c; // Warns! |
| char & c_reference = some_namespace::c; // Warns! |
| |
| class Foo // No Warnings inside Foo, only namespace scope is covered |
| { |
| public: |
| char e = 0; |
| const char f = 0; |
| protected: |
| char g = 0; |
| private: |
| char h = 0; |
| }; |
| |
| Variables: ``a``, ``c``, ``c_ptr1``, ``c_ptr2``, ``c_const_ptr`` and |
| ``c_reference``, will all generate warnings since they are either: |
| a globally accessible variable and non-const, a pointer or reference providing |
| global access to non-const data or both. |