[Boost-commit] svn:boost r58859 - trunk/boost/spirit/home/lex/lexer/lexertl

Subject: [Boost-commit] svn:boost r58859 - trunk/boost/spirit/home/lex/lexer/lexertl
From: hartmut.kaiser_at_[hidden]
Date: 2010-01-09 20:45:58

Author: hkaiser
Date: 2010-01-09 20:45:56 EST (Sat, 09 Jan 2010)
New Revision: 58859
URL: http://svn.boost.org/trac/boost/changeset/58859

Log:
Spirit: added compile time assertion diagnosing a configuration mismatch
Text files modified: 
   trunk/boost/spirit/home/lex/lexer/lexertl/functor_data.hpp        |    10 +++++++++-                              
   trunk/boost/spirit/home/lex/lexer/lexertl/static_functor_data.hpp |    10 +++++++++-                              
   2 files changed, 18 insertions(+), 2 deletions(-)

Modified: trunk/boost/spirit/home/lex/lexer/lexertl/functor_data.hpp
==============================================================================
--- trunk/boost/spirit/home/lex/lexer/lexertl/functor_data.hpp	(original)
+++ trunk/boost/spirit/home/lex/lexer/lexertl/functor_data.hpp	2010-01-09 20:45:56 EST (Sat, 09 Jan 2010)
@@ -59,7 +59,15 @@
 
             // The following functions are used by the implementation of the 
             // placeholder '_state'.
-            void set_state_name (char_type const*) {}
+            template <typename Char>
+            void set_state_name (Char const*) 
+            {
+                // If you see a compile time assertion below you're probably 
+                // using a token type not supporting lexer states (the 3rd 
+                // template parameter of the token is mpl::false_), but your 
+                // code uses state changes anyways.
+                BOOST_STATIC_ASSERT(false);
+            }
             char_type const* get_state_name() const { return rules_.initial(); }
             std::size_t get_state_id (char_type const*) const
             {

Modified: trunk/boost/spirit/home/lex/lexer/lexertl/static_functor_data.hpp
==============================================================================
--- trunk/boost/spirit/home/lex/lexer/lexertl/static_functor_data.hpp	(original)
+++ trunk/boost/spirit/home/lex/lexer/lexertl/static_functor_data.hpp	2010-01-09 20:45:56 EST (Sat, 09 Jan 2010)
@@ -75,7 +75,15 @@
 
             // The following functions are used by the implementation of the 
             // placeholder '_state'.
-            void set_state_name (char_type const*) {}
+            template <typename Char>
+            void set_state_name (Char const*) 
+            {
+                // If you see a compile time assertion below you're probably 
+                // using a token type not supporting lexer states (the 3rd 
+                // template parameter of the token is mpl::false_), but your 
+                // code uses state changes anyways.
+                BOOST_STATIC_ASSERT(false);
+            }
             char_type const* get_state_name() const 
             { 
                 return get_state_name_(0);