46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
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//===- unittest/Tooling/RecursiveASTVisitorTests/Concept.cpp----------------==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "TestVisitor.h"
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#include "clang/AST/ExprConcepts.h"
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using namespace clang;
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namespace {
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struct ConceptVisitor : ExpectedLocationVisitor<ConceptVisitor> {
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bool VisitConceptSpecializationExpr(ConceptSpecializationExpr *E) {
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++ConceptSpecializationExprsVisited;
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return true;
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}
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bool TraverseConceptReference(const ConceptReference &R) {
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++ConceptReferencesTraversed;
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return true;
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}
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int ConceptSpecializationExprsVisited = 0;
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int ConceptReferencesTraversed = 0;
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};
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TEST(RecursiveASTVisitor, ConstrainedParameter) {
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ConceptVisitor Visitor;
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EXPECT_TRUE(Visitor.runOver("template <typename T> concept Fooable = true;\n"
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"template <Fooable T> void bar(T);",
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ConceptVisitor::Lang_CXX2a));
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// Check that we visit the "Fooable T" template parameter's TypeConstraint's
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// ImmediatelyDeclaredConstraint, which is a ConceptSpecializationExpr.
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EXPECT_EQ(1, Visitor.ConceptSpecializationExprsVisited);
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// There are two ConceptReference objects in the AST: the base subobject
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// of the ConceptSpecializationExpr, and the base subobject of the
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// TypeConstraint itself. To avoid traversing the concept and arguments
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// multiple times, we only traverse one.
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EXPECT_EQ(1, Visitor.ConceptReferencesTraversed);
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}
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} // end anonymous namespace
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