[Error] cannot bind ‘std::ostream {aka std::basic_ostream＜char＞}‘ l value To'std::basic_ostream<char>&&'

This error message means that you are trying to assign a value to an output stream (std::ostream) using an lvalue (an expression that refers to an object that has a memory address) but the type of the lvalue is not compatible with the type of the output stream.

For example, if you have the following code:

int main() {
    int x = 42;
    std::ostream out;
    out = x;
    return 0;
}

You will get the error message because you cannot assign an integer value to an output stream. You need to use the insertion operator (<<) to write the value to the stream:

int main() {
    int x = 42;
    std::ostream out;
    out << x;
    return 0;
}

This will write the value of x to the output stream.