`DIR-15-8-1`: move assignment self-assignment false positive

[fjatWbyT]

Affected rules

• DIR-15-8-1

Description

Using the "move-and-swap idiom" proposed in the directive's example as a solution to address potential issues with self-assignment leads to an alert.

Example

#include <utility>

class resource_manager {
  public:
    resource_manager() = default;
    ~resource_manager() = default;
    resource_manager(resource_manager const&) = delete;
    resource_manager(resource_manager&&) = default;
    resource_manager& operator=(resource_manager const&) = delete;
    resource_manager& operator=(resource_manager&& other) & noexcept {
        resource_manager temp{std::move(other)};
        std::swap(resource_, temp.resource_);
        return *this;
    }
  private:
    using resource = int;
    resource resource_;
};

int main() {}

I am getting a

"DIR-15-8-1: User-provided copy assignment operators and move assignment operators shall handle self-assignment","User-provided copy assignment operators and move assignment operators shall handle self-assignment.","error","User defined copy or user defined move does not handle self-assignment correctly.","/main.cpp","10","23","10","31"

when analyzing with cpp/misra/src/rules/DIR-15-8-1/CopyAndMoveAssignmentsShallHandleSelfAssignment.ql.