[Boost-commit] svn:boost r44525 - trunk/libs/spirit/example/qi

From: joel_at_[hidden]
Date: 2008-04-17 20:55:12

Author: djowel
Date: 2008-04-17 20:55:12 EDT (Thu, 17 Apr 2008)
New Revision: 44525
URL: http://svn.boost.org/trac/boost/changeset/44525

Log:
added example on various ways to attach actions
Added:
   trunk/libs/spirit/example/qi/actions.cpp   (contents, props changed)
Text files modified: 
   trunk/libs/spirit/example/qi/Jamfile |     1 +                                       
   1 files changed, 1 insertions(+), 0 deletions(-)

Modified: trunk/libs/spirit/example/qi/Jamfile
==============================================================================
--- trunk/libs/spirit/example/qi/Jamfile	(original)
+++ trunk/libs/spirit/example/qi/Jamfile	2008-04-17 20:55:12 EDT (Thu, 17 Apr 2008)
@@ -6,6 +6,7 @@
 #==============================================================================
 project spirit-qi-example ;
 
+exe actions : actions.cpp ;
 exe sum : sum.cpp ;
 exe complex_number : complex_number.cpp ;
 exe employee : employee.cpp ;

Added: trunk/libs/spirit/example/qi/actions.cpp
==============================================================================
--- (empty file)
+++ trunk/libs/spirit/example/qi/actions.cpp	2008-04-17 20:55:12 EDT (Thu, 17 Apr 2008)
@@ -0,0 +1,51 @@
+#include <iostream>
+#include <boost/spirit/include/qi.hpp>
+#include <boost/lambda/lambda.hpp>
+#include <boost/bind.hpp>
+
+// Presented are various ways to attach semantic actions
+//  * Using plain function pointers
+//  * Using plain simple function objects
+//  * Using plain boost.bind
+//  * Using plain boost.lambda
+
+using namespace boost::spirit;
+
+void write(int& i)
+{
+    std::cout << i << std::endl;
+}
+
+struct write_action
+{
+    void operator()(int& i, unused_type, unused_type) const
+    {
+        std::cout << i << std::endl;
+    }
+};
+
+int main()
+{
+    char const *s1 = "{42}", *e1 = s1 + std::strlen(s1);
+
+    { // example using plain functions
+
+        qi::parse(s1, e1, '{' >> int_[&write] >> '}');
+    }
+
+    { // example using simple function objects
+
+        qi::parse(s1, e1, '{' >> int_[write_action()] >> '}');
+    }
+
+    { // example using boost.bind
+
+        qi::parse(s1, e1, '{' >> int_[boost::bind(&write, _1)] >> '}');
+    }
+
+    { // example using boost.lambda
+
+        using boost::lambda::_1;
+        qi::parse(s1, e1, '{' >> int_[std::cout << _1 << '\n'] >> '}');
+    }}
+