Define rtc::BufferT, like rtc::Buffer but for any trivial type

webrtc/base/copyonwritebuffer.h

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 18 matching lines @@
   CopyOnWriteBuffer(const CopyOnWriteBuffer& buf);
   // Move contents from an existing buffer.
   CopyOnWriteBuffer(CopyOnWriteBuffer&& buf);
 
   // Construct a buffer with the specified number of uninitialized bytes.
   explicit CopyOnWriteBuffer(size_t size);
   CopyOnWriteBuffer(size_t size, size_t capacity);
 
   // Construct a buffer and copy the specified number of bytes into it. The
   // source array may be (const) uint8_t*, int8_t*, or char*.
-  template <typename T, typename internal::ByteType<T>::t = 0>
+  template <typename T,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   CopyOnWriteBuffer(const T* data, size_t size)
       : CopyOnWriteBuffer(data, size, size) {}
-  template <typename T, typename internal::ByteType<T>::t = 0>
+  template <typename T,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   CopyOnWriteBuffer(const T* data, size_t size, size_t capacity)
       : CopyOnWriteBuffer(size, capacity) {
     if (buffer_) {
       std::memcpy(buffer_->data(), data, size);
     }
   }
 
   // Construct a buffer from the contents of an array.
-  template <typename T, size_t N, typename internal::ByteType<T>::t = 0>
-  CopyOnWriteBuffer(const T(&array)[N])  // NOLINT: runtime/explicit
+  template <typename T,
+            size_t N,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
+  CopyOnWriteBuffer(const T (&array)[N])  // NOLINT: runtime/explicit
       : CopyOnWriteBuffer(array, N) {}
 
   ~CopyOnWriteBuffer();
 
   // Get a pointer to the data. Just .data() will give you a (const) uint8_t*,
   // but you may also use .data<int8_t>() and .data<char>().
-  template <typename T = uint8_t, typename internal::ByteType<T>::t = 0>
+  template <typename T = uint8_t,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   const T* data() const {
     return cdata<T>();
   }
 
   // Get writable pointer to the data. This will create a copy of the underlying
   // data if it is shared with other buffers.
-  template <typename T = uint8_t, typename internal::ByteType<T>::t = 0>
+  template <typename T = uint8_t,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   T* data() {
     RTC_DCHECK(IsConsistent());
     if (!buffer_) {
       return nullptr;
     }
     CloneDataIfReferenced(buffer_->capacity());
     return buffer_->data<T>();
   }
 
   // Get const pointer to the data. This will not create a copy of the
   // underlying data if it is shared with other buffers.
-  template <typename T = uint8_t, typename internal::ByteType<T>::t = 0>
+  template <typename T = uint8_t,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   T* cdata() const {
     RTC_DCHECK(IsConsistent());
     if (!buffer_) {
       return nullptr;
     }
     return buffer_->data<T>();
   }
 
   size_t size() const {
     RTC_DCHECK(IsConsistent());
@@ skipping 41 matching lines @@
     return data()[index];
   }
 
   uint8_t operator[](size_t index) const {
     RTC_DCHECK_LT(index, size());
     return cdata()[index];
   }
 
   // Replace the contents of the buffer. Accepts the same types as the
   // constructors.
-  template <typename T, typename internal::ByteType<T>::t = 0>
+  template <typename T,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   void SetData(const T* data, size_t size) {
     RTC_DCHECK(IsConsistent());
     if (!buffer_ || !buffer_->HasOneRef()) {
       buffer_ = size > 0 ? new RefCountedObject<Buffer>(data, size)
                          : nullptr;
     } else {
       buffer_->SetData(data, size);
     }
     RTC_DCHECK(IsConsistent());
   }
 
-  template <typename T, size_t N, typename internal::ByteType<T>::t = 0>
-  void SetData(const T(&array)[N]) {
+  template <typename T,
+            size_t N,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
+  void SetData(const T (&array)[N]) {
     SetData(array, N);
   }
 
   void SetData(const CopyOnWriteBuffer& buf) {
     RTC_DCHECK(IsConsistent());
     RTC_DCHECK(buf.IsConsistent());
     if (&buf != this) {
       buffer_ = buf.buffer_;
     }
   }
 
   // Append data to the buffer. Accepts the same types as the constructors.
-  template <typename T, typename internal::ByteType<T>::t = 0>
+  template <typename T,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
   void AppendData(const T* data, size_t size) {
     RTC_DCHECK(IsConsistent());
     if (!buffer_) {
       buffer_ = new RefCountedObject<Buffer>(data, size);
       RTC_DCHECK(IsConsistent());
       return;
     }
 
     CloneDataIfReferenced(std::max(buffer_->capacity(),
         buffer_->size() + size));
     buffer_->AppendData(data, size);
     RTC_DCHECK(IsConsistent());
   }
 
-  template <typename T, size_t N, typename internal::ByteType<T>::t = 0>
-  void AppendData(const T(&array)[N]) {
+  template <typename T,
+            size_t N,
+            typename std::enable_if<
+                internal::BufferCompat<uint8_t, T>::value>::type* = nullptr>
+  void AppendData(const T (&array)[N]) {
     AppendData(array, N);
   }
 
   void AppendData(const CopyOnWriteBuffer& buf) {
     AppendData(buf.data(), buf.size());
   }
 
   // Sets the size of the buffer. If the new size is smaller than the old, the
   // buffer contents will be kept but truncated; if the new size is greater,
   // the existing contents will be kept and the new space will be
@@ skipping 67 matching lines @@
     return (!buffer_ || buffer_->capacity() > 0);
   }
 
   // buffer_ is either null, or points to an rtc::Buffer with capacity > 0.
   scoped_refptr<RefCountedObject<Buffer>> buffer_;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_COPYONWRITEBUFFER_H_