example2_glvalues_in_expressions.cpp

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#include <iostream>

int getValue() {
    int a = 42;
    return a;
}

int main() {
    int&& r = getValue();  // getValue() is a prvalue, but r is an xvalue (and hence a glvalue)
    
    std::cout << r << std::endl;  // 'r' is a glvalue

    r = 100;  // Modifies the temporary that was returned by getValue()

    std::cout << r << std::endl;  // 'r' is still a glvalue

    return 0;
}