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Author Topic: sf::NonCopyable  (Read 2234 times)

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lorence30

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sf::NonCopyable
« on: November 02, 2015, 03:41:10 am »
void acceptClient(sf::TcpListener& server)
{

}
int main()
{
    sf::TcpListener server;
   
    sf::Thread thread(&acceptClient,server); //'sf::NonCopyable::NonCopyable(const sf::NonCopyable&)' is private
}

is the only way to pass classes that inheirts sf::NonCopyable class is to pass it by pointer?

eXpl0it3r

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sf::NonCopyable
« Reply #1 on: November 02, 2015, 07:57:22 am »
No, you can pass a reference or a smart pointer as well.
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lefreut

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Re: sf::NonCopyable
« Reply #2 on: November 02, 2015, 04:28:37 pm »
In this case, you need to pass std::ref(server) to sf::Thread to explicitly tell to the compiler that the argument is a reference. Otherwise, the compiler tries to perform a copy.

lorence30

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Re: sf::NonCopyable
« Reply #3 on: November 03, 2015, 09:04:29 am »
struct A
{
    sf::TcpListener server;
    sf::TcpSocket socket;
};

A object = { std::ref(listener), std::ref(socket) };

error:
use of deleted function 'sf::TcpListener::TcpListener(const sf::TcpListener&)

how do i do it correctly?

Nexus

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Re: sf::NonCopyable
« Reply #4 on: November 03, 2015, 10:09:33 am »
If you have access to std::ref(), it's very likely that you can use std::thread as well. You should prefer standard threads where possible.

You don't need to pass reference wrappers to your object, but to the thread.
std::thread(&function, std::ref(arg));

And please have a look at a C++ reference before asking questions about how to use the standard library.
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