comparison DEPENDENCIES/generic/include/boost/iostreams/detail/execute.hpp @ 16:2665513ce2d3

Add boost headers

+/*
+ * 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.)
+ * 
+ * See http://www.boost.org/libs/iostreams for documentation.
+
+ * File:        boost/iostreams/detail/execute.hpp
+ * Date:        Thu Dec 06 13:21:54 MST 2007
+ * Copyright:   2007-2008 CodeRage, LLC
+ * Author:      Jonathan Turkanis
+ * Contact:     turkanis at coderage dot com
+
+ * Defines the overloaded function template 
+ * boost::iostreams::detail::execute_all() and the function template 
+ * boost::iostreams::detail::execute_foreach().
+ *
+ * execute_all() invokes a primary operation and performs a sequence of cleanup 
+ * operations, returning the result of the primary operation if no exceptions
+ * are thrown. If one of the operations throws an exception, performs the
+ * remaining operations and rethrows the initial exception.
+ *
+ * execute_foreach() is a variant of std::foreach which invokes a function 
+ * object for each item in a sequence, catching all execptions and rethrowing
+ * the first caught exception after the function object has been invoked on each
+ * item.
+ */
+
+#ifndef BOOST_IOSTREAMS_DETAIL_EXECUTE_HPP_INCLUDED
+#define BOOST_IOSTREAMS_DETAIL_EXECUTE_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/iostreams/detail/config/limits.hpp>   // MAX_EXECUTE_ARITY
+#include <boost/preprocessor/arithmetic/dec.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/iteration/local.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#include <boost/preprocessor/punctuation/comma_if.hpp>
+#include <boost/utility/result_of.hpp>
+
+namespace boost { namespace iostreams { namespace detail {
+
+// Helper for class template execute_traits.
+template<typename Result>
+struct execute_traits_impl {
+    typedef Result result_type;
+    template<typename Op>
+    static Result execute(Op op) { return op(); }
+};
+
+// Specialization for void return. For simplicity, execute() returns int 
+// for operations returning void. This could be avoided with additional work.
+template<>
+struct execute_traits_impl<void> {
+    typedef int result_type;
+    template<typename Op>
+    static int execute(Op op) { op(); return 0; }
+};
+
+// Deduces the result type of Op and allows uniform treatment of operations 
+// returning void and non-void.
+template< typename Op, 
+          typename Result = // VC6.5 workaround.
+              #if !defined(BOOST_NO_RESULT_OF) && \
+                  !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
+                  typename boost::result_of<Op()>::type
+              #else
+                  BOOST_DEDUCED_TYPENAME Op::result_type
+              #endif
+          >
+struct execute_traits 
+    : execute_traits_impl<Result>
+    { };
+
+// Implementation with no cleanup operations.
+template<typename Op>
+typename execute_traits<Op>::result_type 
+execute_all(Op op) 
+{ 
+    return execute_traits<Op>::execute(op);
+}
+
+// Implementation with one or more cleanup operations
+#define BOOST_PP_LOCAL_MACRO(n) \
+   template<typename Op, BOOST_PP_ENUM_PARAMS(n, typename C)> \
+   typename execute_traits<Op>::result_type \
+   execute_all(Op op, BOOST_PP_ENUM_BINARY_PARAMS(n, C, c)) \
+   { \
+       typename execute_traits<Op>::result_type r; \
+       try { \
+           r = boost::iostreams::detail::execute_all( \
+                   op BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
+                   BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(n), c) \
+               ); \
+       } catch (...) { \
+           try { \
+               BOOST_PP_CAT(c, BOOST_PP_DEC(n))(); \
+           } catch (...) { } \
+           throw; \
+       } \
+       BOOST_PP_CAT(c, BOOST_PP_DEC(n))(); \
+       return r; \
+   } \
+   /**/
+
+#define BOOST_PP_LOCAL_LIMITS (1, BOOST_IOSTREAMS_MAX_EXECUTE_ARITY)
+#include BOOST_PP_LOCAL_ITERATE()
+#undef BOOST_PP_LOCAL_MACRO
+
+template<class InIt, class Op>
+Op execute_foreach(InIt first, InIt last, Op op)
+{
+    if (first == last)
+        return op;
+    try {
+        op(*first);
+    } catch (...) {
+        try {
+            ++first;
+            boost::iostreams::detail::execute_foreach(first, last, op);
+        } catch (...) { }
+        throw;
+    }
+    ++first;
+    return boost::iostreams::detail::execute_foreach(first, last, op);
+}
+
+} } } // End namespaces detail, iostreams, boost.
+
+#endif // #ifndef BOOST_IOSTREAMS_DETAIL_EXECUTE_HPP_INCLUDED