Add Argument::store_into(std::vector<int> &var) method

README.md

@@ -324,8 +324,9 @@ It is possible to bind arguments to a variable storing their value, as an
 alternative to explicitly calling ``program.get<T>(arg_name)`` or ``program[arg_name]``
 
 This is currently implementeted for variables of type ``bool`` (this also
-implicitly calls ``flag()``), ``int``, ``double``, ``std::string`` and
-``std::vector<std::string>``. If the argument is not specified in the command
+implicitly calls ``flag()``), ``int``, ``double``, ``std::string``,
+``std::vector<std::string>`` and ``std::vector<int>``.
+If the argument is not specified in the command
 line, the default value (if set) is set into the variable.
 
 ```cpp
@@ -346,6 +347,12 @@ program.add_argument("--strvar-repeated").append().store_into(strvar_repeated);
 
 std::vector<std::string> strvar_multi_valued;
 program.add_argument("--strvar-multi-valued").nargs(2).store_into(strvar_multi_valued);
+
+std::vector<int> intvar_repeated;
+program.add_argument("--intvar-repeated").append().store_into(intvar_repeated);
+
+std::vector<int> intvar_multi_valued;
+program.add_argument("--intvar-multi-valued").nargs(2).store_into(intvar_multi_valued);
 ```
 
 ### Negative Numbers

include/argparse/argparse.hpp

@@ -740,6 +740,20 @@ class Argument {
     return *this;
   }
 
+  auto &store_into(std::vector<int> &var) {
+    if (m_default_value.has_value()) {
+      var = std::any_cast<std::vector<int>>(m_default_value);
+    }
+    action([this, &var](const std::string &s) {
+      if (!m_is_used) {
+        var.clear();
+      }
+      m_is_used = true;
+      var.push_back(details::parse_number<int, details::radix_10>()(s));
+    });
+    return *this;
+  }
+
   auto &append() {
     m_is_repeatable = true;
     return *this;

test/test_store_into.cpp

@@ -159,3 +159,46 @@ TEST_CASE("Test store_into(vector of string), default value, multi valued, speci
   program.parse_args({"./test.exe", "--strvector-opt", "foo", "bar"});
   REQUIRE(res == std::vector<std::string>{"foo", "bar"});
 }
+
+TEST_CASE("Test store_into(vector of int), no default value, non specified" *
+          test_suite("store_into")) {
+  argparse::ArgumentParser program("test");
+  std::vector<int> res;
+  program.add_argument("--intvector-opt").append().store_into(res);
+
+  program.parse_args({"./test.exe"});
+  REQUIRE(res == std::vector<int>{});
+}
+
+TEST_CASE("Test store_into(vector of int), default value, non specified" *
+          test_suite("store_into")) {
+  argparse::ArgumentParser program("test");
+  std::vector<int> res;
+  program.add_argument("--intvector-opt").append().default_value(
+      std::vector<int>{1, 2}).store_into(res);
+
+  program.parse_args({"./test.exe"});
+  REQUIRE(res == std::vector<int>{1, 2});
+}
+
+TEST_CASE("Test store_into(vector of int), default value, specified" *
+          test_suite("store_into")) {
+  argparse::ArgumentParser program("test");
+  std::vector<int> res;
+  program.add_argument("--intvector-opt").append().default_value(
+      std::vector<int>{1, 2}).store_into(res);
+
+  program.parse_args({"./test.exe", "--intvector-opt", "3", "--intvector-opt", "4"});
+  REQUIRE(res == std::vector<int>{3, 4});
+}
+
+TEST_CASE("Test store_into(vector of int), default value, multi valued, specified" *
+          test_suite("store_into")) {
+  argparse::ArgumentParser program("test");
+  std::vector<int> res;
+  program.add_argument("--intvector-opt").nargs(2).default_value(
+      std::vector<int>{1, 2}).store_into(res);
+
+  program.parse_args({"./test.exe", "--intvector-opt", "3", "4"});
+  REQUIRE(res == std::vector<int>{3, 4});
+}