Re: [boost] [smart ptr] Any interest in copy-on-write pointer for C++11?

On 08/02/13 18:35, Jeffrey Yasskin wrote:

WebKit has a class vaguely like this for your case #2: https://code.google.com/p/chromium/codesearch/#chrome/src/third_party/WebKit... used at https://code.google.com/p/chromium/codesearch/#chrome/src/third_party/WebKit/Source/WebCore/rendering/style/RenderStyle.h&rcl=1360310731&l=137. Semantically every copy is a real copy, and, contrary to Mathias' assertion, couldn't be replaced by a move in C++11, but they want to share identical values when doing so is cheap.

If you want identical values to use the same resource, you should use a flyweight factory.