Added example to README for option=value support

README.md

@@ -934,6 +934,42 @@ foo@bar:/home/dev/$ ./main fex
 baz
 ```
 
+## Using `option=value` syntax
+
+```cpp
+#include "argparse.hpp"
+#include <cassert>
+
+int main(int argc, char *argv[]) {
+  argparse::ArgumentParser program("test");
+  program.add_argument("--foo").implicit_value(true).default_value(false);
+  program.add_argument("--bar");
+
+  try {
+    program.parse_args(argc, argv);
+  }
+  catch (const std::runtime_error& err) {
+    std::cerr << err.what() << std::endl;
+    std::cerr << program;
+    std::exit(1);
+  }
+
+  if (program.is_used("--foo")) {
+    std::cout << "--foo: " << std::boolalpha << program.get<bool>("--foo") << "\n";
+  }
+
+  if (program.is_used("--bar")) {
+    std::cout << "--bar: " << program.get("--bar") << "\n";
+  }  
+}
+```
+
+```console
+foo@bar:/home/dev/$ ./test --bar=BAR --foo
+--foo: true
+--bar: BAR
+```
+
 ## CMake Integration 
 
 Use the latest argparse in your CMake project without copying any content.  

include/argparse/test.cpp

@@ -1,15 +0,0 @@
-#include "argparse.hpp"
-#include <cassert>
-
-int main(int argc, char *argv[]) {
-  argparse::ArgumentParser program("test");
-  program.add_argument("--foo").implicit_value(true).default_value(false);
-  program.add_argument("bar");
-
-  auto unknown_args =
-    program.parse_known_args({"test", "--foo", "--badger", "BAR", "spam"});
-
-  assert(program.get<bool>("--foo") == true);
-  assert(program.get<std::string>("bar") == std::string{"BAR"});
-  assert((unknown_args == std::vector<std::string>{"--badger", "spam"}));
-}

test/test_equals_form.cpp

@@ -29,3 +29,11 @@ TEST_CASE("Duplicate =-named and standard" * test_suite("equals_form")) {
   std::string result2{parser.get("--long")};
   REQUIRE(result2 == "NO_VALUE");
 }
+
+TEST_CASE("Basic --value=value with nargs(2)" * test_suite("equals_form")) {
+  argparse::ArgumentParser parser("test");
+  parser.add_argument("--long").nargs(2);
+  parser.parse_args({"test", "--long=value1", "value2"});
+  REQUIRE((parser.get<std::vector<std::string>>("--long") ==
+           std::vector<std::string>{"value1", "value2"}));
+}