C++: Basic support for C++11 user-defined literals

1. Extends lexer so digit or string can be followed by underscore '_' and
   alphanumeric defining literal.

2. Extends parser so it accepts operator"" _abc(...) user-defined literal
   definition.

3. Adds Token::Flags.userDefinedLiteral bool flag field representing if token
   carries user-defined literal.

4. Adds C++11 auto tests case with: 12_km, 0.5_Pa, 'c'_X, "abd"_L, u"xyz"_M

5. All optional suffix scanning methods now return boolean if the suffix was
   found.

6. Adds C++ Lexer tests for user-defined literals with C++11 feature enabled.

This change however does not make QtCreator understand user-defined literal
semantics, e.g. properly resolve type when applying custom literal operator.

Change-Id: I30e62f025ec9fb11c39261985ea4d772b1a80949
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libs/3rdparty/cplusplus/Lexer.h b/src/libs/3rdparty/cplusplus/Lexer.h
index 0309c69950..c19ee904f9 100644
--- a/src/libs/3rdparty/cplusplus/Lexer.h
+++ b/src/libs/3rdparty/cplusplus/Lexer.h
@@ -100,8 +100,9 @@ private:
     void scanUntilQuote(Token *tok, unsigned char quote);
     bool scanDigitSequence();
     bool scanExponentPart();
-    void scanOptionalFloatingSuffix();
-    void scanOptionalIntegerSuffix(bool allowU = true);
+    bool scanOptionalFloatingSuffix();
+    bool scanOptionalIntegerSuffix(bool allowU = true);
+    void scanOptionalUserDefinedLiteral(Token *tok);
     void scanNumericLiteral(Token *tok);
     void scanPreprocessorNumber(Token *tok, bool dotAlreadySkipped);
     void scanIdentifier(Token *tok, unsigned extraProcessedChars = 0);