#includeIn the above code example, we declare a QVariantMap and insert some key-value pairs into it. We then define a function `displayMap` that takes the QVariantMap as input and uses a const_iterator to iterate over its key-value pairs and print them to the console. The `constBegin` function returns a const_iterator pointing to the first key-value pair in the map, while constEnd returns a const_iterator pointing to the position after the last key-value pair. The `it.key()` and `it.value()` functions provide access to the key and value of each pair, respectively. The library used in this code example is the Qt library, which provides the QVariantMap and QVariantMap const_iterator classes.#include // function to display the key-value pairs in a QVariantMap void displayMap(const QVariantMap& map) { QVariantMap::const_iterator it; for (it = map.constBegin(); it != map.constEnd(); ++it) { qDebug() << it.key() << ": " << it.value(); } } int main() { QVariantMap map; map.insert("name", "John"); map.insert("age", 30); map.insert("gender", "male"); displayMap(map); return 0; }