1 // Copyright 2016 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_CARRAY_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_CARRAY_H_ 7 8 #include <cstddef> 9 10 #include "base/containers/span.h" 11 #include "mojo/public/cpp/bindings/array_traits.h" 12 13 namespace mojo { 14 15 template <typename T> 16 struct ArrayTraits<base::span<T>> { 17 using Element = T; 18 19 // There is no concept of a null span, as it is indistinguishable from the 20 // empty span. 21 static bool IsNull(const base::span<T>& input) { return false; } 22 23 static size_t GetSize(const base::span<T>& input) { return input.size(); } 24 25 static T* GetData(base::span<T>& input) { return input.data(); } 26 27 static const T* GetData(const base::span<T>& input) { return input.data(); } 28 29 static T& GetAt(base::span<T>& input, size_t index) { 30 return input.data()[index]; 31 } 32 33 static const T& GetAt(const base::span<T>& input, size_t index) { 34 return input.data()[index]; 35 } 36 37 static bool Resize(base::span<T>& input, size_t size) { 38 if (size > input.size()) 39 return false; 40 input = input.subspan(0, size); 41 return true; 42 } 43 }; 44 45 } // namespace mojo 46 47 #endif // MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_CARRAY_H_ 48