Token: complement is() method with isOneOf() to allow easier usage

[danielmarjamaki]

Summary

Add isOneOf() method. This can be used to cleanup conditions that calls is() repeatedly.

[alexfh]

Looks good. Thanks!

[danielmarjamaki]

I committed this into clang in revision 239526

include/clang/Lex/Token.h

public:
 
   tok::TokenKind getKind() const { return Kind; }
   void setKind(tok::TokenKind K) { Kind = K; }
 
   /// is/isNot - Predicates to check if this token is a specific kind, as in
   /// "if (Tok.is(tok::l_brace)) {...}".
   bool is(tok::TokenKind K) const { return Kind == K; }
   bool isNot(tok::TokenKind K) const { return Kind != K; }
+  bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const {
+    return is(K1) || is(K2);
+  }
+  template <typename... Ts>
+  bool isOneOf(tok::TokenKind K1, tok::TokenKind K2, Ts... Ks) const {
+    return is(K1) || isOneOf(K2, Ks...);
+  }
 
   /// \brief Return true if this is a raw identifier (when lexing
   /// in raw mode) or a non-keyword identifier (when lexing in non-raw mode).
   bool isAnyIdentifier() const {
     return tok::isAnyIdentifier(getKind());
   }
 
   /// \brief Return true if this is a "literal", like a numeric