Add enable_if_ and enable_if_t. Sever dependency on Core.

test/enable_if_test.cpp

@@ -0,0 +1,92 @@
+/*
+Copyright 2018 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License,
+Version 1.0. (See accompanying file LICENSE_1_0.txt
+or copy at http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/type_traits/enable_if.hpp>
+#include "test.hpp"
+
+template<bool B>
+struct Constant {
+    enum {
+        value = B
+    };
+};
+
+template<class T>
+struct Check
+    : Constant<false> { };
+
+template<>
+struct Check<long>
+    : Constant<true> { };
+
+class Construct {
+public:
+    template<class T>
+    Construct(T, typename boost::enable_if_<Check<T>::value>::type* = 0)
+        : value_(true) { }
+    template<class T>
+    Construct(T, typename boost::enable_if_<!Check<T>::value>::type* = 0)
+        : value_(false) { }
+    bool value() const {
+        return value_;
+    }
+private:
+    bool value_;
+};
+
+template<class T, class E = void>
+struct Specialize;
+
+template<class T>
+struct Specialize<T, typename boost::enable_if_<Check<T>::value>::type>
+    : Constant<true> { };
+
+template<class T>
+struct Specialize<T, typename boost::enable_if_<!Check<T>::value>::type>
+    : Constant<false> { };
+
+template<class T>
+typename boost::enable_if_<Check<T>::value, bool>::type Returns(T)
+{
+    return true;
+}
+
+template<class T>
+typename boost::enable_if_<!Check<T>::value, bool>::type Returns(T)
+{
+    return false;
+}
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+template<class T>
+boost::enable_if_t<Check<T>::value, bool> Alias(T)
+{
+    return true;
+}
+
+template<class T>
+boost::enable_if_t<!Check<T>::value, bool> Alias(T)
+{
+    return false;
+}
+#endif
+
+TT_TEST_BEGIN(enable_if)
+
+BOOST_CHECK(!Construct(1).value());
+BOOST_CHECK(Construct(1L).value());
+BOOST_CHECK(!Specialize<int>::value);
+BOOST_CHECK(Specialize<long>::value);
+BOOST_CHECK(!Returns(1));
+BOOST_CHECK(Returns(1L));
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+BOOST_CHECK(!Alias(1));
+BOOST_CHECK(Alias(1L));
+#endif
+
+TT_TEST_END

test/is_convertible_test.cpp

@@ -11,7 +11,7 @@
 #endif
 #include "test.hpp"
 #include "check_integral_constant.hpp"
-#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/enable_if.hpp>
 
 
 template <class T>
@@ -30,7 +30,7 @@ template<typename T>
 struct test_bug_4530
 {
     template<typename A>
-    test_bug_4530(A&&, typename boost::enable_if< ::tt::is_convertible<A&&, T> >::type* =0);
+    test_bug_4530(A&&, typename boost::enable_if_< ::tt::is_convertible<A&&, T>::value >::type* =0);
 };
 
 struct A4530