Add module support and tests. (#174)

test/module/regex_token_iterator_eg_1.cpp

@@ -0,0 +1,66 @@
+/*
+ *
+ * Copyright (c) 2003-2022
+ * John Maddock
+ *
+ * Use, modification and distribution are subject to 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)
+ *
+ */
+
+ /*
+  *   LOCATION:    see http://www.boost.org for most recent version.
+  *   FILE         regex_token_iterator_example_1.cpp
+  *   VERSION      see <boost/version.hpp>
+  *   DESCRIPTION: regex_token_iterator example: split a string into tokens.
+  */
+
+
+#if (defined(__cpp_lib_modules) || (defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 193833135))) && !defined(TEST_HEADERS)
+import std;
+#elif defined(MSVC_EXPERIMENTAL_STD_MODULE) && !defined(TEST_HEADERS)
+import std.core;
+#else
+#include <iostream>
+#include <string>
+#endif
+
+#ifdef TEST_HEADERS
+#include <boost/regex.hpp>
+#else
+import boost.regex;
+#endif
+
+using namespace std;
+
+int main(int argc, const char*[])
+{
+   string s;
+   do{
+      if(argc == 1)
+      {
+         cout << "Enter text to split (or \"quit\" to exit): ";
+         getline(cin, s);
+         if(s == "quit") break;
+      }
+      else
+         s = "This is a string of tokens";
+
+      boost::regex re("\\s+");
+      boost::sregex_token_iterator i(s.begin(), s.end(), re, -1);
+      boost::sregex_token_iterator j;
+
+      unsigned count = 0;
+      while(i != j)
+      {
+         cout << *i++ << endl;
+         count++;
+      }
+      cout << "There were " << count << " tokens found." << endl;
+
+   }while(argc == 1);
+   return 0;
+}
+
+