/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkSpan_DEFINED
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#define SkSpan_DEFINED
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#include <cstddef>
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#include <vector>
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template <typename T>
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class SkSpan {
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public:
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template <size_t N>
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constexpr SkSpan(T(&t)[N]) : fPtr(t), fSize(N) {}
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constexpr SkSpan() : fPtr{nullptr}, fSize{0} {}
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constexpr SkSpan(T* ptr, size_t size) : fPtr{ptr}, fSize{size} {}
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template <typename U>
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constexpr explicit SkSpan(std::vector<U>& v) : fPtr{v.data()}, fSize{v.size()} {}
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constexpr SkSpan(const SkSpan& o) = default;
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constexpr SkSpan& operator=(const SkSpan& that) {
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fPtr = that.fPtr;
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fSize = that.fSize;
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return *this;
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}
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constexpr T& operator [] (size_t i) const { return fPtr[i]; }
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constexpr T* begin() const { return fPtr; }
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constexpr T* end() const { return fPtr + fSize; }
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constexpr const T* cbegin() const { return fPtr; }
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constexpr const T* cend() const { return fPtr + fSize; }
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constexpr T* data() const { return fPtr; }
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constexpr size_t size() const { return fSize; }
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constexpr bool empty() const { return fSize == 0; }
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constexpr size_t size_bytes() const { return fSize * sizeof(T); }
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constexpr SkSpan<const T> toConst() const { return SkSpan<const T>{fPtr, fSize}; }
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constexpr SkSpan<T> first(size_t prefixLen) { return SkSpan<T>{fPtr, prefixLen}; }
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private:
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T* fPtr;
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size_t fSize;
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};
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#endif // SkSpan_DEFINED
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