initial commitment

[SVN r26900]

example/uncommenting_example.cpp

@@ -0,0 +1,57 @@
+// (C) Copyright Jonathan Turkanis 2003.
+// 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.
+
+#include <iostream>
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filtering_stream.hpp>
+#include "uncommenting_input_filter.hpp"
+
+//
+// Demonstrates the use of uncommenting_input_filter.
+//
+void test_uncommenting()
+{
+    using namespace std;
+    using namespace boost::iostreams;
+    using namespace boost::iostreams::example;
+
+    std::string script = // from boost configure
+        "# Be Bourne compatible\n"
+        "if test -n \"${ZSH_VERSION+set}\" && (emulate sh) >/dev/null 2>&1; then\n"
+        "emulate sh\n"
+        "NULLCMD=:\n"
+        "# Zsh 3.x and 4.x performs word splitting on ${1+\"$@\"}, which\n"
+        "# is contrary to our usage.  Disable this feature.\n"
+        "alias -g '${1+\"$@\"}'='\"$@\"'\n"
+        "elif test -n \"${BASH_VERSION+set}\" && (set -o posix) >/dev/null 2>&1; then\n"
+        "set -o posix\n"
+        "fi\n"
+        "\n"
+        "# Support unset when possible.\n"
+        "if (FOO=FOO; unset FOO) >/dev/null 2>&1; then\n"
+        "as_unset=unset\n"
+        "else\n"
+        "as_unset=false\n"
+        "fi";
+
+    filtering_istream in;
+    in.push(uncommenting_input_filter());
+    in.push(script.begin(), script.end());
+
+    // Print unfiltered script.
+    cout << "**** Script with comments ****\n\n" << script << "\n\n";
+
+    // Print filtered script:
+    cout << "**** Script with comments removed ****\n\n";
+    boost::iostreams::copy(in, cout);
+    cout << "\n\n";
+}
+
+int main()
+{
+    test_uncommenting();
+    return 0;
+}