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Copy pathStreamOperations.h
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108 lines (88 loc) · 2.84 KB
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#ifndef SCHEINERMAN_STREAM_STREAM_OPERATIONS_H
#define SCHEINERMAN_STREAM_STREAM_OPERATIONS_H
namespace stream {
template<typename F, typename G>
class Compose {
public:
Compose(F&& f, G&& g) : f_(std::forward<F>(f)), g_(std::forward<G>(g)) {}
template<typename T>
std::result_of_t<F(std::result_of_t<G(Stream<T>&&)>)> operator() (Stream<T>&& stream) {
return f_(g_(std::forward<Stream<T>>(stream)));
}
private:
F f_;
G g_;
};
template<typename F>
class Operator {
public:
Operator(const std::string& name, F&& op) : name_(name), operator_(std::forward<F>(op)) {}
Operator(F&& op) : operator_(std::forward<F>(op)) {}
template<typename T>
std::result_of_t<F(Stream<T>&&)> apply_to(Stream<T>&& stream) {
if(!name_.empty()) {
stream.check_vacant(name_);
}
return operator_(std::forward<Stream<T>>(stream));
}
template<typename G>
Operator<Compose<G, F>> operator| (Operator<G>&& right) {
return {{std::move(right.operator_), std::move(operator_)}};
}
template<typename G>
Terminator<Compose<G, F>> operator| (Terminator<G>&& right) {
return {{std::move(right.terminator_), std::move(operator_)}};
}
Operator<F> rename(const std::string& name) && {
name_ = name;
return std::move(*this);
}
template<typename> friend class Operator;
private:
std::string name_;
F operator_;
};
template<typename F>
class Terminator {
public:
Terminator(const std::string& name, F&& term) : name_(name), terminator_(term) {}
Terminator(F&& term) : terminator_(term) {}
template<typename T>
auto apply_to(Stream<T>&& stream) -> std::result_of_t<F(Stream<T>&&)> {
if(!name_.empty()) {
stream.check_vacant(name_);
}
try {
return terminator_(std::forward<Stream<T>>(stream));
} catch(EmptyStreamException& e) {
if(!name_.empty()) {
throw EmptyStreamException(name_);
} else {
throw;
}
}
stream.close();
}
Terminator<F> rename(const std::string& name) && {
name_ = name;
return std::move(*this);
}
template<typename G>
Terminator<Compose<G, F>> then(G&& function) {
return {Compose<G, F>(std::forward<G>(function), std::move(terminator_))};
}
template<typename> friend class Operator;
private:
std::string name_;
F terminator_;
};
template<typename Function>
Operator<Function> make_operator(const std::string& name, Function&& function) {
return Operator<Function>(name, std::forward<Function>(function));
}
template<typename Function>
Terminator<Function> make_terminator(const std::string& name, Function&& function) {
return Terminator<Function>(name, std::forward<Function>(function));
}
} /* namespace stream */
#endif