Update README.md

README.md

@@ -3,61 +3,70 @@
 ## Positional Arguments
 
 ```cpp
-#include <argparse.hpp>
-
-int main(int argc, char *argv[]) {
 argparse::ArgumentParser program("main");
 
 program.add_argument("input");
 program.add_argument("output");
 
-  program.parse(argc, argv);
+program.parse_args({"./main", "rocket.msh", "thrust_profile.csv"});
-  std::string input = program.get("input");
-  std::string output = program.get("output");
 
-  return 0;
+std::string input = program.get("input");     // "rocket.msh"
-}
+std::string output = program.get("output");   // "thrust_profile.csv"
 ```
 
 ## Optional Arguments
 
 ```cpp
-#include <argparse.hpp>
-
-int main(int argc, char *argv[]) {
 argparse::ArgumentParser program("main");
 
 program.add_argument("--config")
   .help("configuration file")
-    .default_value(std::string("config.yml"));
+  .default_value(std::string("config.json"));
 
 program.add_argument("-n", "--num_iterations")
   .help("The list of input files")
   .action([](const std::string& value) { return std::stoi(value); });
 
-  program.parse(argc, argv);
+program.parse_args({"./main", "-n", "36"});
-  std::string config = program.get("--config");
-  int num_iterations = program.get<int>("-n");  
 
-  return 0;
+std::string config = program.get("--config");   // config.json
-}
+int num_iterations = program.get<int>("-n");    // 36
 ```
 
-## List of Arguments
+## Vector of Arguments
 
 ```cpp
-#include <argparse.hpp>
-
-int main(int argc, char *argv[]) {
 argparse::ArgumentParser program("main");
 
 program.add_argument("--input_files")
   .help("The list of input files")
   .nargs(3);
 
-  program.parse(argc, argv);
+program.parse_args({"./main", "--input_files", "config.yml", "System.xml"});
-  std::vector<std::string> files = program.get<std::vector<std::string>>("--input_files");  
 
-  return 0;
+auto files = program.get<std::vector<std::string>>("--input_files");  // {"config.yml", "System.xml"}
-}
+```
+
+## Compound Toggle Arguments
+
+```cpp
+argparse::ArgumentParser program("test");
+
+program.add_argument("-a")
+  .default_value(false)
+  .implicit_value(true);
+
+program.add_argument("-b")
+  .default_value(false)
+  .implicit_value(true);
+
+program.add_argument("-c")
+  .nargs(2)
+  .action([](const std::string& value) { return std::stof(value); });
+
+program.parse_args({ "./main", "-abc", "3.14", "2.718" });
+
+auto a = program.get<bool>("-a");                // true
+auto b = program.get<bool>("-b");                // true
+auto c = program.get<std::vector<float>>("-c");  // {3.14f, 2.718f}
 ```