🟢 Port problem 2703 (Return Length of Arguments Passed) from Swift to C++23

solutions/2701-2800/2703-return-length-of-arguments-passed/README.md

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+# 2703. Return Length of Arguments Passed
+
+[LeetCode problem 2703](https://leetcode.com/problems/return-length-of-arguments-passed/)
+
+- **Difficulty**: Easy
+- **Tags**: javascript
+
+## Description
+
+Write a function that accepts any number of arguments of any type and
+returns how many arguments it received. The original problem is
+JavaScript-specific (it hands back `arguments.length`); here it's modeled as
+a function taking a brace-init list of `std::any` values.

solutions/2701-2800/2703-return-length-of-arguments-passed/solution.cpp

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+#include "solution.hpp"
+
+namespace leetcode::p2703 {
+
+std::size_t solve(std::initializer_list<std::any> args) {
+    return args.size();
+}
+
+} // namespace leetcode::p2703

solutions/2701-2800/2703-return-length-of-arguments-passed/solution.hpp

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+#pragma once
+
+#include <any>
+#include <cstddef>
+#include <initializer_list>
+
+namespace leetcode::p2703 {
+
+// optimized: O(1) time, O(1) space — an initializer_list already knows its
+// size.
+std::size_t solve(std::initializer_list<std::any> args);
+
+} // namespace leetcode::p2703

solutions/2701-2800/2703-return-length-of-arguments-passed/test.cpp

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+#include <any>
+#include <string>
+
+#include <catch2/catch_test_macros.hpp>
+
+#include "solution.hpp"
+
+TEST_CASE("Problem 2703", "[p2703]") {
+    CHECK(leetcode::p2703::solve({std::any{}, std::string("hello"), 2}) == 3);
+    CHECK(leetcode::p2703::solve({}) == 0);
+    CHECK(leetcode::p2703::solve({1, 2, 3, std::any{}, 5}) == 5);
+}