A C++ status variable class that throws when there is a status code indicating a problem.

status_variable.hpp

// The status_variable class is a templated class that is used to handle the status
// of a variable with a predefined success code. Any assignment to this variable
// that does not match the success code results in an exception being thrown.
template <typename T>
class status_variable
{
public:
    status_variable() = default;
    explicit status_variable(int success_code) : success_code(success_code) {}
    void operator=(T other)
    {
        if (other != success_code)
        {
            throw std::runtime_error(fmt::format("Error in status, expected value {}, got {}", success_code, other));
        }
    }

private:
    T success_code = 0;
};

An example usage is like so:

status_variable<int> status;

try
{
    status = some_op();
    status = some_op2();
catch (...)
{
    // catch logic
}

The whole thing is useful if you have a bunch of similar calls with the same success status code, and you don't want to try and catch each and every one of them separately.