[ASTMatchers] Add hasInClassInitializer traversal matcher for FieldDecl.

Summary:
I needed to know whether a FieldDecl had an in-class
initializer for D26453. I used a narrowing matcher there, but a
traversal matcher might be generally useful.

Reviewers: sbenza, bkramer, klimek, aaron.ballman

Subscribers: aaron.ballman, Prazek, cfe-commits

Differential Revision: https://reviews.llvm.org/D28034

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@290492 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp b/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
index b7ffd75384..6037127feb 100644
--- a/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
+++ b/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
@@ -1404,6 +1404,16 @@ TEST(Member, BitFields) {
                       fieldDecl(isBitField(), hasBitWidth(2), hasName("a"))));
 }
 
+TEST(Member, InClassInitializer) {
+  EXPECT_TRUE(
+      matches("class C { int a = 2; int b; };",
+              fieldDecl(hasInClassInitializer(integerLiteral(equals(2))),
+                        hasName("a"))));
+  EXPECT_TRUE(
+      notMatches("class C { int a = 2; int b; };",
+                 fieldDecl(hasInClassInitializer(anything()), hasName("b"))));
+}
+
 TEST(Member, UnderstandsAccess) {
   EXPECT_TRUE(matches(
     "struct A { int i; };", fieldDecl(isPublic(), hasName("i"))));