Changes between Version 6 and Version 7 of C++Features

Timestamp:

Aug 18, 2025, 2:02:39 PM (4 months ago)

Author:

Eric Pettersen

Comment:

--

C++Features

@@ -68 +68 @@
     };
 }}}
+
+== Any type ==
+
+Hold a copy of a value and its type.
+
+{{{
+#include <any>
+#include <iostream>
+#include <string>
+
+int main() {
+    std::any a; // Empty std::any
+
+    a = 42; // Stores an int
+    std::cout << "Value: " << std::any_cast<int>(a) << std::endl;
+
+    a = "Hello, C++!"; // Stores a const char*
+    std::cout << "Value: " << std::any_cast<const char*>(a) << std::endl;
+
+    a = std::string("Dynamic string"); // Stores a std::string
+    std::cout << "Value: " << std::any_cast<std::string>(a) << std::endl;
+
+    try {
+        // Attempting to cast to the wrong type will throw an exception
+        std::cout << std::any_cast<double>(a) << std::endl;
+    } catch (const std::bad_any_cast& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+    return 0;
+}
+}}}