On 09/17/10 13:31, OvermindDL1 wrote:
On Fri, Sep 17, 2010 at 9:46 AM, <dherring@ll.mit.edu> wrote: [snip]
It doesn't satisfy my need for everything to be in-place (e.g. for seamless use with shared memory, memory pools, etc.). [Note: we don't actually use std::string; it was just convenient for the example.]
How is it not in-place?
If C++ supported unions containing anything, then boost::variant<int,std::string,myClass> would be identical in layout to: struct { uint which; union { int i; std::string s; myClass m; } } Which all use the same memory.
Maybe Daniel doesn't want to pay for the extra memory required by the which. At least that's the only reason I can think of :( So, Daniel, I've the same question as OvermindDl1. Could you clarify "in-place"? -regards, Larry