Function effect_to_std_function

include/fplus/side_effects.hpp:218–223

// Converts an arbitrary callable effect to an std::function.
template <typename Effect>
std::function<internal::invoke_result_t<Effect>()> effect_to_std_function(Effect eff)
{
    return [eff] {
        return internal::invoke(eff);
    };
}

// API search type: execute_max_n_times_until_success : (Int, Io (), Int) -> Io Bool
// Returns a function that (when called) executes a side effect