Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/src/boost/libs/program_options/example/custom_syntax.cpp b/src/boost/libs/program_options/example/custom_syntax.cpp
new file mode 100644
index 00000000..829087d9
--- /dev/null
+++ b/src/boost/libs/program_options/example/custom_syntax.cpp
@@ -0,0 +1,63 @@
+// Copyright Vladimir Prus 2002-2004.
+// 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)
+
+/** This example shows how to support custom options syntax.
+
+    It's possible to install 'custom_parser'. It will be invoked on all command 
+    line tokens and can return name/value pair, or nothing. If it returns 
+    nothing, usual processing will be done.
+*/
+
+
+#include <boost/program_options/options_description.hpp>
+#include <boost/program_options/parsers.hpp>
+#include <boost/program_options/variables_map.hpp>
+
+using namespace boost::program_options;
+
+#include <iostream>
+using namespace std;
+
+/*  This custom option parse function recognize gcc-style 
+    option "-fbar" / "-fno-bar".
+*/
+pair<string, string> reg_foo(const string& s)
+{
+    if (s.find("-f") == 0) {
+        if (s.substr(2, 3) == "no-")
+            return make_pair(s.substr(5), string("false"));
+        else
+            return make_pair(s.substr(2), string("true"));
+    } else {
+        return make_pair(string(), string());
+    }    
+}
+
+int main(int ac, char* av[])
+{
+    try {
+        options_description desc("Allowed options");
+        desc.add_options()
+        ("help", "produce a help message")
+        ("foo", value<string>(), "just an option")
+        ;
+
+        variables_map vm;
+        store(command_line_parser(ac, av).options(desc).extra_parser(reg_foo)
+              .run(), vm);
+
+        if (vm.count("help")) {
+            cout << desc;
+            cout << "\nIn addition -ffoo and -fno-foo syntax are recognized.\n";
+        }
+        if (vm.count("foo")) {
+            cout << "foo value with the value of " 
+                 << vm["foo"].as<string>() << "\n";
+        }
+    }
+    catch(exception& e) {
+        cout << e.what() << "\n";
+    }
+}