整理

include/boost/bind/apply.hpp

@@ -0,0 +1,29 @@
+#ifndef BOOST_BIND_APPLY_HPP_INCLUDED
+#define BOOST_BIND_APPLY_HPP_INCLUDED
+
+//
+// apply.hpp
+//
+// Copyright 2002, 2003, 2024 Peter Dimov
+//
+// 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)
+//
+
+namespace boost
+{
+
+template<class R> struct apply
+{
+    typedef R result_type;
+
+    template<class F, class... A> result_type operator()( F&& f, A&&... a ) const
+    {
+        return static_cast<F&&>( f )( static_cast<A&&>( a )... );
+    }
+};
+
+} // namespace boost
+
+#endif // #ifndef BOOST_BIND_APPLY_HPP_INCLUDED