Adding example program for prefix program

examples/CMakeLists.txt

@@ -18,3 +18,4 @@ add_cli_exe(simple simple.cpp)
 add_cli_exe(subcommands subcommands.cpp)
 add_cli_exe(groups groups.cpp)
 add_cli_exe(inter_argument_order inter_argument_order.cpp)
+add_cli_exe(prefix_command prefix_command.cpp)

examples/prefix_command.cpp

@@ -0,0 +1,32 @@
+#include "CLI/CLI.hpp"
+
+int main(int argc, char **argv) {
+
+    CLI::App app("Prefix command app");
+    app.prefix_command();
+
+    std::vector<int> vals;
+    app.add_option("--vals,-v", vals)
+        ->expected(1);
+
+    std::vector<std::string> more_comms;
+    try {
+        more_comms = app.parse(argc, argv);
+    } catch(const CLI::ParseError &e) {
+        return app.exit(e);
+    }
+
+    std::cout << "Prefix:";
+    for(int v : vals)
+        std::cout << v << ":";
+    
+    std::cout << std::endl << "Remaining commands: ";
+
+    // Perfer to loop over from beginning, not "pop" order
+    std::reverse(std::begin(more_comms), std::end(more_comms));
+    for(auto com : more_comms)
+        std::cout << com << " ";
+    std::cout << std::endl;
+
+    return 0;
+}