changes after pre-review

[SVN r1503]

test/enable_if_Makefile

@@ -1,6 +1,6 @@
 CXX = g++ -I${HOME}/boost -I../../..
 
-all: enable_if_constructors.run enable_if_dummy_arg_disambiguation.run enable_if_namespace_disambiguation.run enable_if_no_disambiguation.run enable_if_lazy.run enable_if_member_templates.run enable_if_partial_specializations.run
+all: enable_if_constructors.run enable_if_dummy_arg_disambiguation.run enable_if_namespace_disambiguation.run enable_if_no_disambiguation.run enable_if_lazy.run enable_if_member_templates.run enable_if_partial_specializations.run enable_if_lazy_test.run
 
 enable_if_constructors.run: enable_if_constructors.exe
 	./enable_if_constructors.exe
@@ -51,5 +51,14 @@ enable_if_partial_specializations.run: enable_if_partial_specializations.exe
 enable_if_partial_specializations.exe: enable_if_partial_specializations.cpp
 	$(CXX) -o enable_if_partial_specializations.exe enable_if_partial_specializations.cpp
 
+
+enable_if_lazy_test.run: enable_if_lazy_test.exe
+	./enable_if_lazy_test.exe
+	touch enable_if_lazy_test.run
+
+enable_if_lazy_test.exe: enable_if_lazy_test.cpp
+	$(CXX) -o enable_if_lazy_test.exe enable_if_lazy_test.cpp
+
+
 clean:
-	-rm -f enable_if_constructors.run enable_if_dummy_arg_disambiguation.run enable_if_lazy.run enable_if_member_templates.run enable_if_namespace_disambiguation.run enable_if_no_disambiguation.run enable_if_partial_specializations.run enable_if_constructors.exe enable_if_dummy_arg_disambiguation.exe enable_if_lazy.exe enable_if_member_templates.exe enable_if_namespace_disambiguation.exe enable_if_no_disambiguation.exe enable_if_partial_specializations.exe
+	-rm -f enable_if_constructors.run enable_if_dummy_arg_disambiguation.run enable_if_lazy.run enable_if_member_templates.run enable_if_namespace_disambiguation.run enable_if_no_disambiguation.run enable_if_partial_specializations.run enable_if_lazy_test.run enable_if_constructors.exe enable_if_dummy_arg_disambiguation.exe enable_if_lazy.exe enable_if_member_templates.exe enable_if_namespace_disambiguation.exe enable_if_no_disambiguation.exe enable_if_partial_specializations.exe enable_if_lazy_test.exe

test/enable_if_constructors.cpp

@@ -22,11 +22,11 @@ struct container {
   bool my_value;
 
   template <class T>
-  container(const T&, const typename enable_if<is_arithmetic<T>::value, T>::type * = 0):
+  container(const T&, const typename enable_if<is_arithmetic<T>, T>::type * = 0):
   my_value(true) {}
 
   template <class T>
-  container(const T&, const typename disable_if<is_arithmetic<T>::value, T>::type * = 0):
+  container(const T&, const typename disable_if<is_arithmetic<T>, T>::type * = 0):
   my_value(false) {}
 };
 
@@ -36,7 +36,7 @@ struct xstring
 {
   template <class It>
   xstring(It begin, It end, typename 
-	 enable_if<!is_arithmetic<It>::value>::type* = 0)
+	 disable_if<is_arithmetic<It> >::type* = 0)
     : data(end-begin) {}
   
   int data;

test/enable_if_dummy_arg_disambiguation.cpp

@@ -22,11 +22,11 @@ template <int N> struct dummy {
 };
 
 template<class T>
-typename enable_if<is_arithmetic<T>::value, bool>::type
+typename enable_if<is_arithmetic<T>, bool>::type
 arithmetic_object(T t, dummy<0> = 0) { return true; }
 
 template<class T>
-typename enable_if<!is_arithmetic<T>::value, bool>::type
+typename enable_if<!is_arithmetic<T>, bool>::type
 arithmetic_object(T t, dummy<1> = 0) { return false; }
 
 

test/enable_if_lazy.cpp

@@ -14,8 +14,8 @@
 #include <boost/utility/enable_if.hpp>
 #include <boost/type_traits/is_arithmetic.hpp>
 
-using boost::enable_if;
-using boost::enable_if_lazy;
+using boost::enable_if_c;
+using boost::lazy_enable_if_c;
 using boost::is_arithmetic;
 
 // This class provides a reduced example of a traits class for computing
@@ -43,26 +43,27 @@ struct mult_traits<double, double> {
 
 // Next, a forwarding function mult() is defined.  It is enabled only when
 // mult_traits<T, U>::exists is true.  The first version, using normal
-// enable_if, works with only some compilers (it does not work in g++):
+// enable_if_c, works with only some compilers (it does not work in g++):
 
 #if 0
 template <class T, class U>
-typename enable_if<
+typename enable_if_c<
 	  mult_traits<T, U>::exists, 
 	  typename mult_traits<T, U>::type>::type
 mult(const T& x, const U& y) {return x * y;}
 #endif
 
-// An improved version that works with more compilers uses enable_if_lazy.
+// An improved version that works with more compilers uses lazy_enable_if_c.
 // This template removes compiler errors from invalid code used as an
-// argument to enable_if.
+// argument to enable_if_c.
 
 template <class T, class U>
-typename enable_if_lazy<
+typename lazy_enable_if_c<
 	  mult_traits<T, U>::exists, 
 	  mult_traits<T, U> >::type
 mult(const T& x, const U& y) {return x * y;}
 
+
 int test_main(int, char*[])
 {
  

test/enable_if_lazy_test.cpp

@@ -0,0 +1,93 @@
+//
+//    Copyright 2003 <20> The Trustees of Indiana University.  All rights
+//    reserved.
+//
+//    See the file enable_if_LICENSE for licensing conditions.
+//
+//    Authors: Jaakko J<>rvi (jajarvi@osl.iu.edu)
+//             Jeremiah Willcock (jewillco@osl.iu.edu)
+//             Andrew Lumsdaine (lums@osl.iu.edu)
+//
+
+#include <boost/test/minimal.hpp>
+#include <boost/mpl/not.hpp>
+
+#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/is_arithmetic.hpp>
+
+using boost::lazy_enable_if;
+using boost::lazy_disable_if;
+
+using boost::lazy_enable_if_c;
+using boost::lazy_disable_if_c;
+
+using boost::is_arithmetic;
+
+template <class T>
+struct some_traits {
+  BOOST_STATIC_CONSTANT(bool, value = false);
+};
+
+template <>
+struct some_traits<int> {
+  BOOST_STATIC_CONSTANT(bool, value = true);
+  typedef bool type;
+};
+
+template <>
+struct some_traits<double> {
+  BOOST_STATIC_CONSTANT(bool, value = true);
+  typedef bool type;
+};
+
+template <class T>
+struct make_bool {
+  typedef bool type;
+};
+
+template <>
+struct make_bool<int> {};
+
+template <>
+struct make_bool<double> {};
+
+namespace A {
+
+  template<class T>
+  typename lazy_enable_if<some_traits<T>, some_traits<T> >::type
+  foo(T t) { return true; }
+
+  template<class T>
+  typename lazy_enable_if_c<some_traits<T>::value, some_traits<T> >::type
+  foo2(T t) { return true; }
+}
+
+namespace B {
+  template<class T>
+  typename lazy_disable_if<some_traits<T>, make_bool<T> >::type
+  foo(T t) { return false; }
+
+  template<class T>
+  typename lazy_disable_if_c<some_traits<T>::value, make_bool<T> >::type
+  foo2(T t) { return false; }
+}
+
+int test_main(int, char*[])
+{
+  using namespace A;
+  using namespace B;
+  BOOST_TEST(foo(1));
+  BOOST_TEST(foo(1.0));
+
+  BOOST_TEST(!foo("1"));  
+  BOOST_TEST(!foo(static_cast<void*>(0)));  
+
+  BOOST_TEST(foo2(1));
+  BOOST_TEST(foo2(1.0));
+
+  BOOST_TEST(!foo2("1"));  
+  BOOST_TEST(!foo2(static_cast<void*>(0)));  
+
+  return 0;
+}
+

test/enable_if_member_templates.cpp

@@ -20,11 +20,11 @@ using boost::is_arithmetic;
 
 struct container {
   template <class T>
-  typename enable_if<is_arithmetic<T>::value, bool>::type
+  typename enable_if<is_arithmetic<T>, bool>::type
   arithmetic_object(const T&, const int* /* disambiguate */ = 0) {return true;}
 
   template <class T>
-  typename disable_if<is_arithmetic<T>::value, bool>::type
+  typename disable_if<is_arithmetic<T>, bool>::type
   arithmetic_object(const T&) {return false;}
 };
 

test/enable_if_namespace_disambiguation.cpp

@@ -10,22 +10,24 @@
 //
 
 #include <boost/test/minimal.hpp>
+#include <boost/mpl/not.hpp>
 
 #include <boost/utility/enable_if.hpp>
 #include <boost/type_traits/is_arithmetic.hpp>
 
 using boost::enable_if;
+using boost::mpl::not_;
 using boost::is_arithmetic;
 
 namespace A {
   template<class T>
-  typename enable_if<is_arithmetic<T>::value, bool>::type
+  typename enable_if<is_arithmetic<T>, bool>::type
   arithmetic_object(T t) { return true; }
 }
 
 namespace B {
   template<class T>
-  typename enable_if<!is_arithmetic<T>::value, bool>::type
+  typename enable_if<not_<is_arithmetic<T> >, bool>::type
   arithmetic_object(T t) { return false; }
 }
 

test/enable_if_no_disambiguation.cpp

@@ -10,19 +10,21 @@
 //
 
 #include <boost/test/minimal.hpp>
+#include <boost/mpl/not.hpp>
 
 #include <boost/utility/enable_if.hpp>
 #include <boost/type_traits/is_arithmetic.hpp>
 
+using boost::mpl::not_;
 using boost::enable_if;
 using boost::is_arithmetic;
 
 template<class T>
-typename enable_if<is_arithmetic<T>::value, bool>::type
+typename enable_if<is_arithmetic<T>, bool>::type
 arithmetic_object(T t) { return true; }
 
 template<class T>
-typename enable_if<!is_arithmetic<T>::value, bool>::type
+typename enable_if<not_<is_arithmetic<T> >, bool>::type
 arithmetic_object(T t) { return false; }
 
 

test/enable_if_partial_specializations.cpp

@@ -14,6 +14,8 @@
 #include <boost/utility/enable_if.hpp>
 #include <boost/type_traits/is_arithmetic.hpp>
 
+using boost::enable_if_c;
+using boost::disable_if_c;
 using boost::enable_if;
 using boost::disable_if;
 using boost::is_arithmetic;
@@ -22,12 +24,25 @@ template <class T, class Enable = void>
 struct tester;
 
 template <class T>
-struct tester<T, typename enable_if<is_arithmetic<T>::value>::type> {
+struct tester<T, typename enable_if_c<is_arithmetic<T>::value>::type> {
   BOOST_STATIC_CONSTANT(bool, value = true);
 };
 
 template <class T>
-struct tester<T, typename disable_if<is_arithmetic<T>::value>::type> {
+struct tester<T, typename disable_if_c<is_arithmetic<T>::value>::type> {
+  BOOST_STATIC_CONSTANT(bool, value = false);
+};
+
+template <class T, class Enable = void>
+struct tester2;
+
+template <class T>
+struct tester2<T, typename enable_if<is_arithmetic<T> >::type> {
+  BOOST_STATIC_CONSTANT(bool, value = true);
+};
+
+template <class T>
+struct tester2<T, typename disable_if<is_arithmetic<T> >::type> {
   BOOST_STATIC_CONSTANT(bool, value = false);
 };
 
@@ -40,6 +55,12 @@ int test_main(int, char*[])
   BOOST_TEST(!tester<char*>::value);
   BOOST_TEST(!tester<void*>::value);
 
+  BOOST_TEST(tester2<int>::value);
+  BOOST_TEST(tester2<double>::value);
+
+  BOOST_TEST(!tester2<char*>::value);
+  BOOST_TEST(!tester2<void*>::value);
+
   return 0;
 }