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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "array.h"
#include <vector>
namespace vespalib {
/**
* This is a simple wrapper class for a typed array with no memory ownership.
* It is similar to vespalib::stringref
**/
template <typename T>
class ArrayRef {
public:
ArrayRef() : _v(nullptr), _sz(0) { }
ArrayRef(T * v, size_t sz) : _v(v), _sz(sz) { }
ArrayRef(std::vector<T> & v) : _v(&v[0]), _sz(v.size()) { }
ArrayRef(Array<T> &v) : _v(&v[0]), _sz(v.size()) { }
T & operator [] (size_t i) { return _v[i]; }
const T & operator [] (size_t i) const { return _v[i]; }
size_t size() const { return _sz; }
T *begin() { return _v; }
T *end() { return _v + _sz; }
private:
T * _v;
size_t _sz;
};
template <typename T>
class ConstArrayRef {
public:
ConstArrayRef(const T *v, size_t sz) : _v(v), _sz(sz) { }
ConstArrayRef(const std::vector<T> & v) : _v(&v[0]), _sz(v.size()) { }
ConstArrayRef(const ArrayRef<T> & v) : _v(&v[0]), _sz(v.size()) { }
ConstArrayRef(const Array<T> &v) : _v(&v[0]), _sz(v.size()) { }
ConstArrayRef() : _v(nullptr), _sz(0) {}
const T & operator [] (size_t i) const { return _v[i]; }
size_t size() const { return _sz; }
const T *cbegin() const { return _v; }
const T *cend() const { return _v + _sz; }
const T *begin() const { return _v; }
const T *end() const { return _v + _sz; }
private:
const T *_v;
size_t _sz;
};
// const-cast for array references; use with care
template <typename T>
ArrayRef<T> unconstify(const ConstArrayRef<T> &ref) {
return ArrayRef<T>(const_cast<T*>(&ref[0]), ref.size());
}
}
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