stream_base: WriteWrap::New/::Dispose

Encapsulate allocation/disposal of `WriteWrap` instances into the
`WriteWrap` class itself.

PR-URL: https://github.com/iojs/io.js/pull/1090
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 26 insertions, 0 deletions

diff --git a/src/stream_base-inl.h b/src/stream_base-inl.h
index 46d9f78905..8f7f5fea41 100644
--- a/src/stream_base-inl.h
+++ b/src/stream_base-inl.h
@@ -15,6 +15,7 @@ using v8::FunctionTemplate;
 using v8::Handle;
 using v8::HandleScope;
 using v8::Local;
+using v8::Object;
 using v8::PropertyAttribute;
 using v8::PropertyCallbackInfo;
 using v8::String;
@@ -82,6 +83,31 @@ void StreamBase::JSMethod(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set((wrap->*Method)(args));
 }
 
+
+WriteWrap* WriteWrap::New(Environment* env,
+                          Local<Object> obj,
+                          StreamBase* wrap,
+                          DoneCb cb,
+                          size_t extra) {
+  size_t storage_size = ROUND_UP(sizeof(WriteWrap), kAlignSize) + extra;
+  char* storage = new char[storage_size];
+
+  return new(storage) WriteWrap(env, obj, wrap, cb);
+}
+
+
+void WriteWrap::Dispose() {
+  this->~WriteWrap();
+  delete[] reinterpret_cast<char*>(this);
+}
+
+
+char* WriteWrap::Extra(size_t offset) {
+  return reinterpret_cast<char*>(this) +
+         ROUND_UP(sizeof(*this), kAlignSize) +
+         offset;
+}
+
 }  // namespace node
 
 #endif  // SRC_STREAM_BASE_INL_H_