1 // Copyright 2023 The Chromium Authors 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 BASE_MEMORY_RAW_SPAN_H_ 6 #define BASE_MEMORY_RAW_SPAN_H_ 7 8 #include "base/containers/span.h" 9 #include "base/memory/raw_ptr.h" 10 11 namespace base { 12 13 // raw_span<T> is a type that provides the spatial safety of span<T> along 14 // with the temporal safety of raw_ptr<T>. This is intended to be a safer 15 // replacement for classes that store pointer + size fields. As is the case 16 // with raw_ptr<>, raw_span<> should be used for class members only, with 17 // ordinary span<> used for function arguments and the like. Note that 18 // raw_span<> will implicitly convert to span<> for ease of use in these 19 // cases. 20 21 template <typename T, RawPtrTraits Traits = RawPtrTraits::kEmpty> 22 using raw_span = 23 span<T, dynamic_extent, raw_ptr<T, Traits | AllowPtrArithmetic>>; 24 25 template <typename T> ExtractAsDanglingSpan(raw_span<T> & arg)26auto ExtractAsDanglingSpan(raw_span<T>& arg) { 27 raw_span<T, DisableDanglingPtrDetection> result = 28 std::exchange(arg, raw_span<T>()); 29 return result; 30 } 31 32 } // namespace base 33 34 #endif // BASE_MEMORY_RAW_SPAN_H_ 35