I am writing a NamedPipe extraction for C++11 and would like to have the following API*:
template<typename Mode>
class NamedPipe final {
public:
void Open();
std::enable_if<Mode == Receiver>
void Send();
std::enable_if<Mode == Receiver>
void Receive();
void Close();
}
So that use looks like so:
NamedPipe<Sender> pipe_sender("test");
NamedPipe<Reciever> pipe_receiver("test");
pipe_sender.Open();
pipe_receiver.Open();
pipe_sender.Send("Some data");
pipe_receiver.Receive();
pipe_sender.Receive(); <--- compilation error
I have been using the type_traits
in C++11 but only really just got into them - I've really enjoyed using them but this is really flexing the learning curve. Is there anyone with enough knowledge to point me in the right direction?
* the first example is deliberately rough as I keep going around in circles with the template stuff - I really just need to be put on the right path!
You can force compilation errors easily with static assertions:
template<typename Mode>
class NamedPipe final {
public:
void Open();
void Send();
void Receive();
void Close();
}
template<typename Mode>
void NamedPipe<Mode>::Send() {
static_assert(std::is_same<Mode, Sender>::value, "Cannot send from receivers");
// blah blah implementation
}
template<typename Mode>
void NamedPipe<Mode>::Receive() {
static_assert(std::is_same<Mode, Receiver>::value, "Cannot receive with senders");
// blah blah implementation
}
This not only gives compilation errors, but it gives nice descriptive errors.