[cfe-dev] Questions about Getting the Full Name in Using Declaration

Manuel Klimek via cfe-dev cfe-dev at lists.llvm.org
Thu Oct 25 00:37:05 PDT 2018

The ::foo::bar is the nested name specifier.
According to https://clang.llvm.org/doxygen/classclang_1_1UsingDecl.html
UsingDecl has getQualifier().
In clang-query you can follow this for a file like this:
namespace a { namespace b { class C; } };
using ::a::b::C

clang_query t.cc --
> set output print
clang-query> m usingDecl(has(nestedNameSpecifier().bind("x")))

Match #1:

Binding for "root":
using ::a::b::C
Binding for "x":
1 match.

On Thu, Oct 25, 2018 at 2:26 AM Yucheng Wu <
ywu19 at students.claremontmckenna.edu> wrote:

> Hello,
> I'm working on writing new checks for *clang-tidy *with a group of
> students. In one of our checks, I want to get the full name of the alias of
> using declarations by calling getNameAsString() on the MatchedDecl (which
> is Result.Nodes.getNodeAs<UsingDecl>("x")), but the resulting string is
> only part of the full name. For example, for using ::foo::bar, the string
> after the above operation is bar instead of ::foo::bar. Is there a
> standard way of accessing the full name of the alias in a using declaration?
> Best,
> Yucheng Wu
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