modernize-replace-disallow-copy-and-assign-macro¶
Finds macro expansions of DISALLOW_COPY_AND_ASSIGN(Type)
and replaces them
with a deleted copy constructor and a deleted assignment operator.
Before the delete
keyword was introduced in C++11 it was common practice to
declare a copy constructor and an assignment operator as a private members. This
effectively makes them unusable to the public API of a class.
With the advent of the delete
keyword in C++11 we can abandon the
private
access of the copy constructor and the assignment operator and
delete the methods entirely.
When running this check on a code like this:
class Foo {
private:
DISALLOW_COPY_AND_ASSIGN(Foo);
};
It will be transformed to this:
class Foo {
private:
Foo(const Foo &) = delete;
const Foo &operator=(const Foo &) = delete;
};
Known Limitations¶
Notice that the migration example above leaves the
private
access specification untouched. You might want to run the check:doc:modernize-use-equals-delete <modernize-use-equals-delete> to get warnings for deleted functions in private sections.
Options¶
-
MacroName
¶
A string specifying the macro name whose expansion will be replaced. Default is DISALLOW_COPY_AND_ASSIGN.
See: https://en.cppreference.com/w/cpp/language/function#Deleted_functions