Synopsis

(Required) The source code used to implement an entity shall appear only once

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

Duplicate implementation of an antity found.

Coding standards

This check does not correspond to any coding standard rules.

Code examples

The following code example fails the check and will give a warning:

// Include guards skipped for brevity.
// file1.h 
template< typename T > class A {};

// file2.h
#include "file1.h"

A< int > const a1 {};

// file3.h
#include "file1.h"

template<> class A< int > {}; // Non-compliant

// main.cc
#include "file1.h"
#include "file2.h" // ODR violation
#include "file3.h"

The following code example passes the check and will not give a warning about this issue:

// Not applicable.