add parse_check()

cmdline.h

@@ -518,6 +518,24 @@ public:
     return errors.size()==0;
   }
 
+  void parse_check(const std::string &arg){
+    if (!options.count("help"))
+      add("help", '?', "print this message");
+    check(0, parse(arg));
+  }
+
+  void parse_check(const std::vector<std::string> &args){
+    if (!options.count("help"))
+      add("help", '?', "print this message");
+    check(args.size(), parse(args));
+  }
+
+  void parse_check(int argc, char *argv[]){
+    if (!options.count("help"))
+      add("help", '?', "print this message");
+    check(argc, parse(argc, argv));
+  }
+
   std::string error() const{
     return errors.size()>0?errors[0]:"";
   }
@@ -562,6 +580,18 @@ public:
 
 private:
 
+  void check(int argc, bool ok){
+    if ((argc==1 && !ok) || exist("help")){
+      std::cerr<<usage();
+      exit(0);
+    }
+
+    if (!ok){
+      std::cerr<<error()<<std::endl<<usage();
+      exit(1);
+    }
+  }
+
   void set_option(const std::string &name){
     if (options.count(name)==0){
       errors.push_back("undefined option: --"+name);

test.cpp

@@ -36,21 +36,10 @@ int main(int argc, char *argv[])
   a.add<string>("host", 'h', "host name", true, "");
   a.add<int>("port", 'p', "port number", false, 80, cmdline::range(1, 65535));
   a.add<string>("type", 't', "protocol type", false, "http", cmdline::oneof<string>("http", "https", "ssh", "ftp"));
-  a.add("help", 0, "print this message");
   a.footer("filename ...");
   a.set_program_name("test");
 
-  bool ok=a.parse(argc, argv);
-
-  if (argc==1 || a.exist("help")){
-    cerr<<a.usage();
-    return 0;
-  }
-  
-  if (!ok){
-    cerr<<a.error()<<endl<<a.usage();
-    return 0;
-  }
+  a.parse_check(argc, argv);
 
   cout<<a.get<string>("host")<<":"<<a.get<int>("port")<<endl;
 

test2.cpp

@@ -0,0 +1,61 @@
+/*
+Copyright (c) 2009, Hideyuki Tanaka
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the <organization> nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY <copyright holder> ''AS IS'' AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "cmdline.h"
+
+#include <iostream>
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+  cmdline::parser a;
+  a.add<string>("host", 'h', "host name", true, "");
+  a.add<int>("port", 'p', "port number", false, 80, cmdline::range(1, 65535));
+  a.add<string>("type", 't', "protocol type", false, "http", cmdline::oneof<string>("http", "https", "ssh", "ftp"));
+  a.add("help", 0, "print this message");
+  a.footer("filename ...");
+  a.set_program_name("test");
+
+  bool ok=a.parse(argc, argv);
+
+  if (argc==1 || a.exist("help")){
+    cerr<<a.usage();
+    return 0;
+  }
+  
+  if (!ok){
+    cerr<<a.error()<<endl<<a.usage();
+    return 0;
+  }
+
+  cout<<a.get<string>("host")<<":"<<a.get<int>("port")<<endl;
+
+  for (size_t i=0; i<a.rest().size(); i++)
+    cout<<"- "<<a.rest()[i]<<endl;
+
+  return 0;
+}