ASTMatchersMacros.h

/// AST_MATCHER_P(Type, DefineMatcher, ParamType, Param) { ... }
/// defines a single-parameter function named DefineMatcher() that returns a
/// Matcher<Type> object.
///
/// The code between the curly braces has access to the following variables:
///
///   Node:                  the AST node being matched; its type is Type.
///   Param:                 the parameter passed to the function; its type
///                          is ParamType.
///   Finder:                an ASTMatchFinder*.
///   Builder:               a BoundNodesTreeBuilder*.
///
/// The code should return true if 'Node' matches.
#define AST_MATCHER_P(Type, DefineMatcher, ParamType, Param)                   \
  AST_MATCHER_P_OVERLOAD(Type, DefineMatcher, ParamType, Param, 0)

#define AST_MATCHER_P_OVERLOAD(Type, DefineMatcher, ParamType, Param,          \
                               OverloadId)                                     \
  namespace internal {                                                         \
  class matcher_##DefineMatcher##OverloadId##Matcher                           \
      : public ::clang::ast_matchers::internal::MatcherInterface<Type> {       \
  public:                                                                      \
    explicit matcher_##DefineMatcher##OverloadId##Matcher(ParamType A##Param)  \
        : Param(std::move(A##Param)) {}                                        \
    bool matches(const Type &Node,                                             \
                 ::clang::ast_matchers::internal::ASTMatchFinder *Finder,      \
                 ::clang::ast_matchers::internal::BoundNodesTreeBuilder        \
                     *Builder) const override;                                 \
                                                                               \
  private:                                                                     \
    ParamType const Param;                                                     \
  };                                                                           \
  }                                                                            \
  inline ::clang::ast_matchers::internal::Matcher<Type> DefineMatcher(         \
      ParamType Param) {                                                       \
    return ::clang::ast_matchers::internal::makeMatcher(                       \
        new internal::matcher_##DefineMatcher##OverloadId##Matcher(            \
            std::move(Param)));                                                \
  }                                                                            \
  typedef ::clang::ast_matchers::internal::Matcher<Type> (                     \
      &DefineMatcher##_Type##OverloadId)(ParamType Param);                     \
  inline bool internal::matcher_##DefineMatcher##OverloadId##Matcher::matches( \
      const Type &Node,                                                        \
      ::clang::ast_matchers::internal::ASTMatchFinder *Finder,                 \
      ::clang::ast_matchers::internal::BoundNodesTreeBuilder *Builder) const