Add bind_front_obj_constexpr_test

test/Jamfile

@@ -59,3 +59,4 @@ run bind_front_mfn_test.cpp ;
 run bind_front_md_test.cpp ;
 
 compile bind_front_fn_constexpr_test.cpp ;
+compile bind_front_obj_constexpr_test.cpp ;

test/bind_front_obj_constexpr_test.cpp

@@ -0,0 +1,96 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct F1
+{
+    constexpr int operator()()
+    {
+        return -1;
+    }
+
+    constexpr int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct F2
+{
+    constexpr int operator()( int x1, int x2 ) &
+    {
+        return 100*x1 + 10*x2 + 1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const &
+    {
+        return 100*x1 + 10*x2 + 2;
+    }
+    constexpr int operator()( int x1, int x2 ) &&
+    {
+        return 100*x1 + 10*x2 + 3;
+    }
+    constexpr int operator()( int x1, int x2 ) const &&
+    {
+        return 100*x1 + 10*x2 + 4;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( F2(), 9 )( 8 ), 983 );
+    }
+
+    {
+        constexpr auto fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 982 );
+    }
+
+    {
+        constexpr auto fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 984 );
+    }
+}
+
+#endif