Add bind_front_fn_constexpr_test

test/Jamfile

@@ -57,3 +57,5 @@ run bind_front_fn_test.cpp ;
 run bind_front_obj_test.cpp ;
 run bind_front_mfn_test.cpp ;
 run bind_front_md_test.cpp ;
+
+compile bind_front_fn_constexpr_test.cpp ;

test/bind_front_fn_constexpr_test.cpp

@@ -0,0 +1,60 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#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))
+
+constexpr int f0()
+{
+ return -1;
+}
+
+constexpr int f1( int x1 ) noexcept
+{
+ return x1;
+}
+
+constexpr int f2( int x1, int x2 )
+{
+ return 10*x1+x2;
+}
+
+constexpr int f3( int x1, int x2, int x3 ) noexcept
+{
+ return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+ BOOST_TEST_EQ( boost::compat::bind_front( f0 )(), -1 );
+ BOOST_TEST_EQ( boost::compat::bind_front( f1 )( 1 ), 1 );
+ BOOST_TEST_EQ( boost::compat::bind_front( f2 )( 1, 2 ), 12 );
+ BOOST_TEST_EQ( boost::compat::bind_front( f3 )( 1, 2, 3 ), 123 );
+
+ BOOST_TEST_EQ( boost::compat::bind_front( f1, 1 )(), 1 );
+ BOOST_TEST_EQ( boost::compat::bind_front( f2, 1 )( 2 ), 12 );
+ BOOST_TEST_EQ( boost::compat::bind_front( f3, 1 )( 2, 3 ), 123 );
+
+ BOOST_TEST_EQ( boost::compat::bind_front( f2, 1, 2 )(), 12 );
+ BOOST_TEST_EQ( boost::compat::bind_front( f3, 1, 2 )( 3 ), 123 );
+
+ BOOST_TEST_EQ( boost::compat::bind_front( f3, 1, 2, 3 )(), 123 );
+}
+
+#endif