intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 168 insertions, 0 deletions

diff --git a/library/cpp/deprecated/accessors/memory_traits.h b/library/cpp/deprecated/accessors/memory_traits.h
new file mode 100644
index 0000000000..aa837705d3
--- /dev/null
+++ b/library/cpp/deprecated/accessors/memory_traits.h
@@ -0,0 +1,168 @@
+#pragma once
+
+#include <util/generic/array_ref.h>
+#include <util/memory/blob.h>
+#include <util/memory/tempbuf.h>
+#include <util/generic/buffer.h>
+#include <util/generic/strbuf.h>
+#include <util/generic/string.h>
+#include <util/generic/vector.h>
+#include <util/generic/typetraits.h>
+
+#include <array>
+#include <string>
+#include <utility>
+
+template <typename T>
+struct TMemoryTraits {
+    enum {
+        SimpleMemory = std::is_arithmetic<T>::value,
+        ContinuousMemory = SimpleMemory,
+        OwnsMemory = SimpleMemory,
+    };
+
+    using TElementType = T;
+};
+
+template <typename T, size_t n>
+struct TMemoryTraits<T[n]> {
+    enum {
+        SimpleMemory = TMemoryTraits<T>::SimpleMemory,
+        ContinuousMemory = SimpleMemory,
+        OwnsMemory = SimpleMemory,
+    };
+
+    using TElementType = T;
+};
+
+template <typename T, size_t n>
+struct TMemoryTraits<std::array<T, n>> {
+    enum {
+        SimpleMemory = TMemoryTraits<T>::SimpleMemory,
+        ContinuousMemory = SimpleMemory,
+        OwnsMemory = SimpleMemory,
+    };
+
+    using TElementType = T;
+};
+
+template <typename A, typename B>
+struct TMemoryTraits<std::pair<A, B>> {
+    enum {
+        SimpleMemory = TMemoryTraits<A>::SimpleMemory && TMemoryTraits<B>::SimpleMemory,
+        ContinuousMemory = SimpleMemory,
+        OwnsMemory = SimpleMemory,
+    };
+
+    using TElementType = std::pair<A, B>;
+};
+
+template <>
+struct TMemoryTraits<TBuffer> {
+    enum {
+        SimpleMemory = false,
+        ContinuousMemory = true,
+        OwnsMemory = true,
+    };
+
+    using TElementType = char;
+};
+
+template <>
+struct TMemoryTraits<TTempBuf> {
+    enum {
+        SimpleMemory = false,
+        ContinuousMemory = true,
+        OwnsMemory = true,
+    };
+
+    using TElementType = char;
+};
+
+template <>
+struct TMemoryTraits< ::TBlob> {
+    enum {
+        SimpleMemory = false,
+        ContinuousMemory = true,
+        OwnsMemory = true,
+    };
+
+    using TElementType = char;
+};
+
+template <typename T>
+struct TElementDependentMemoryTraits {
+    enum {
+        SimpleMemory = false,
+        ContinuousMemory = TMemoryTraits<T>::SimpleMemory,
+    };
+
+    using TElementType = T;
+};
+
+template <typename T, typename TAlloc>
+struct TMemoryTraits<std::vector<T, TAlloc>>: public TElementDependentMemoryTraits<T> {
+    enum {
+        OwnsMemory = TMemoryTraits<T>::OwnsMemory
+    };
+};
+
+template <typename T, typename TAlloc>
+struct TMemoryTraits<TVector<T, TAlloc>>: public TMemoryTraits<std::vector<T, TAlloc>> {
+};
+
+template <typename T>
+struct TMemoryTraits<TTempArray<T>>: public TElementDependentMemoryTraits<T> {
+    enum {
+        OwnsMemory = TMemoryTraits<T>::OwnsMemory
+    };
+};
+
+template <typename T, typename TCharTraits, typename TAlloc>
+struct TMemoryTraits<std::basic_string<T, TCharTraits, TAlloc>>: public TElementDependentMemoryTraits<T> {
+    enum {
+        OwnsMemory = TMemoryTraits<T>::OwnsMemory
+    };
+};
+
+template <>
+struct TMemoryTraits<TString>: public TElementDependentMemoryTraits<char> {
+    enum {
+        OwnsMemory = true
+    };
+};
+
+template <>
+struct TMemoryTraits<TUtf16String>: public TElementDependentMemoryTraits<wchar16> {
+    enum {
+        OwnsMemory = true
+    };
+};
+
+template <typename T>
+struct TMemoryTraits<TArrayRef<T>>: public TElementDependentMemoryTraits<T> {
+    enum {
+        OwnsMemory = false
+    };
+};
+
+template <typename TCharType, typename TCharTraits>
+struct TMemoryTraits<TBasicStringBuf<TCharType, TCharTraits>>: public TElementDependentMemoryTraits<TCharType> {
+    enum {
+        OwnsMemory = false
+    };
+};
+
+template <>
+struct TMemoryTraits<TStringBuf>: public TElementDependentMemoryTraits<char> {
+    enum {
+        OwnsMemory = false
+    };
+};
+
+template <>
+struct TMemoryTraits<TWtringBuf>: public TElementDependentMemoryTraits<wchar16> {
+    enum {
+        OwnsMemory = false
+    };
+};