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.. 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.
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