streams.h

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#pragma once
#include <utility>
 
template<typename T>
struct Sink {
    virtual bool full()=0;
    virtual void push(const T& t) {
        push(std::move(T{t}));
    }
    virtual void push(T&&)=0;
    void trypush(T&& t) {
        if (full()) return;
        push(std::move(t));
    }
};
 
template<typename T>
struct Source {
    virtual bool empty()=0;
    virtual T pop()=0;
};