cppcoreguidelines-avoid-non-const-global-variables¶
Finds non-const global variables as described in I.2 of C++ Core Guidelines. As R.6 of C++ Core Guidelines is a duplicate of rule I.2 it also covers that rule.
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.
Options¶
- AllowInternalLinkage¶
- When set to true, static non-const variables and variables in anonymous namespaces will not generate a warning. The default value is false.