Stream/Stream.cpp at master · GBlodgett35/Stream · GitHub

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/*
Author: Greg Blodgett
The template extention of the BaseStream class.
Reference: https://docs.oracle.com/javase/8/docs/api/?java/util/stream/Stream.html
*/


#include<iostream>
#include<functional>
#include<vector>
#include "BaseStream.h"
#include "IntStream.h"

template<typename T>
class Stream : public BaseStream<T> {
public:
	Stream(std::vector<T> const&);
	Stream(const Stream<T>& );
	~Stream();
	template<typename Function> auto map(Function) const;
	IntStream mapToInt(std::function<int(const T&)>) const;
	auto forEach(std::function<void(const T&)>) const;
	auto forEach(std::ostream&) const;
	auto filter(std::function<bool(const T&)>) const;
	bool anyMatch(std::function<bool(const T&)>) const;
	bool allMatch(std::function<bool(const T&)>) const;
	bool noneMatch(std::function<bool(const T&)>) const;
	int count() const;
	std::optional<T> findFirst(std::function<bool(const T&)>) const;
	const T* toArray() const;
	Stream<T> operator = (Stream<T> const&);
	static Stream<T> of(T args...);
private:
	const std::vector<T> elements;
};

template<typename T>
Stream<T>::~Stream() {}

template<typename T>
Stream<T>::Stream(const Stream<T> &other ) {
	this->elements = other.elements;
}

template<typename T>
Stream<T> Stream<T>::operator=(Stream<T> const & obj)
{
	return Stream<T>{obj};
}

template<typename T>
Stream<T>::Stream(std::vector<T> const& e) : elements(e){}


template<typename T>
Stream<T> Stream<T>::of(T args...)
{
	return Stream{ std::vector<T>{args} };
}
//             ---------------------------------------------------------------------------
template<typename T>
static Stream<T> of(T args...) {
	return Stream{ std::vector<T>{args} };
}

template<typename T>
template<typename Function>
auto Stream<T>::map(Function func) const
{
	T throwAway = elements.at(0);
	using R = decltype(func(throwAway));
	std::vector<R> newStream;
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		T copy = *i;
		newStream.push_back(func(copy));
	}
	return Stream<R>{newStream};
}

template<typename T>
auto Stream<T>::filter(std::function<bool(const T&)> predicate) const
{
	std::vector<T> newStream;
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		if (predicate(*i)) {
			newStream.push_back(*i);
		}
	}
	return Stream<T>{newStream};
}


template<typename T>
auto Stream<T>::forEach(std::function<void(const T&)> consumer) const
{
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		consumer(*i);
	}
}

template<typename T>
auto Stream<T>::forEach(std::ostream &stream) const
{
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		stream << *i << " ";
	}
}

template<typename T>
bool Stream<T>::anyMatch(std::function<bool(const T&)> predicate) const
{
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		if (predicate(*i)) {
			return true;
		}
	}
	return false;
}

template<typename T>
bool Stream<T>::allMatch(std::function<bool(const T&)> predicate) const
{
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		if (!predicate(*i)) {
			return false;
		}
	}
	return true;
}

template<typename T>
bool Stream<T>::noneMatch(std::function<bool(const T&)> predicate) const
{
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		if (predicate(*i)) {
			return false;
		}
	}
	return true;
}

template<typename T>
int Stream<T>::count() const {
	return elements.size();
}

template<typename T>
IntStream Stream<T>::mapToInt(std::function<int(const T&)> mapper) const
{
	std::vector<int> intStream;
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		intStream.push_back(mapper(*i));
	}
	return IntStream{intStream};
}

template<typename T>
const T * Stream<T>::toArray() const
{
	return &elements[0];
}

template<typename T>
std::optional<T> Stream<T>::findFirst(std::function<bool(const T&)> target) const
{
	for (auto i = elements.begin(); i != elements.end(); ++i) {
		if (target(*i)) {
			return std::optional<T>{*i};
		}
	}
	return std::nullopt;
}