File: insertcpp.cc

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    #include <iostream>
    #include <memory>
    #include <cstring>
    using namespace std;

    int main()
    {
        unique_ptr<string> sp{ new string{ "Hello world" } };

        cout << *sp << '\n';
        sp->insert(strlen("Hello "), "C++ ");
        cout << *sp << '\n';
    }
    /*
        Displays:
            Hello world
            Hello C++ world
    */