整理

include/boost/bind/protect.hpp

@@ -0,0 +1,69 @@
+#ifndef BOOST_BIND_PROTECT_HPP_INCLUDED
+#define BOOST_BIND_PROTECT_HPP_INCLUDED
+
+//
+// protect.hpp
+//
+// Copyright 2002, 2020 Peter Dimov
+// Copyright 2009 Steven Watanabe
+//
+// 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 <utility>
+
+namespace boost
+{
+
+namespace _bi
+{
+
+template<class T> struct protect_make_void
+{
+    typedef void type;
+};
+
+template<class F, class E = void> struct protect_result_type
+{
+};
+
+template<class F> struct protect_result_type< F, typename protect_make_void<typename F::result_type>::type >
+{
+    typedef typename F::result_type result_type;
+};
+
+template<class F> class protected_bind_t: public protect_result_type<F>
+{
+private:
+
+    F f_;
+
+public:
+
+    explicit protected_bind_t( F f ): f_( f )
+    {
+    }
+
+    template<class... A> auto operator()( A&&... a ) -> decltype( f_( std::forward<A>(a)... ) )
+    {
+        return f_( std::forward<A>(a)... );
+    }
+
+    template<class... A> auto operator()( A&&... a ) const -> decltype( f_( std::forward<A>(a)... ) )
+    {
+        return f_( std::forward<A>(a)... );
+    }
+};
+
+} // namespace _bi
+
+template<class F> _bi::protected_bind_t<F> protect(F f)
+{
+    return _bi::protected_bind_t<F>(f);
+}
+
+} // namespace boost
+
+#endif // #ifndef BOOST_BIND_PROTECT_HPP_INCLUDED