llvm-project/clang-tools-extra/docs/clang-tidy/checks/bugprone-forward-declaratio...

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.. title:: clang-tidy - bugprone-forward-declaration-namespace
bugprone-forward-declaration-namespace
======================================
Checks if an unused forward declaration is in a wrong namespace.
The check inspects all unused forward declarations and checks if there is any
declaration/definition with the same name existing, which could indicate that
the forward declaration is in a potentially wrong namespace.
.. code-block:: c++
namespace na { struct A; }
namespace nb { struct A {}; }
nb::A a;
// warning : no definition found for 'A', but a definition with the same name
// 'A' found in another namespace 'nb::'
This check can only generate warnings, but it can't suggest a fix at this point.