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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
<https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#i2-avoid-non-const-global-variables>`_
of C++ Core Guidelines.
As `R.6 <https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rr-global>`_
of C++ Core Guidelines is a duplicate of rule `I.2
<https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#i2-avoid-non-const-global-variables>`_
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;
};
The variables ``a``, ``c``, ``c_ptr1``, ``c_const_ptr`` and ``c_reference``
will all generate warnings since they are either a non-const globally accessible
variable, a pointer or a reference providing global access to non-const data
or both.
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