cdd70681   
   From: dave@boostpro.com   
      
   on Sat Oct 01 2011, Ken  wrote:   
      
   > Hi,   
   >   
   > I need to allocate an array of 100mln small objects Foo dynamically at   
   > once.   
   >   
   > I have no issues telling std::vector how many I want, but I really   
   > don't want to call Foo() 100mln times (default constructor does   
   > nothing - would be fine if the objects were zero'ed out).   
   >   
   > If Foo is a POD and I know that zero-initialization is ok, I can use   
   > calloc() to allocate my array and free() it later.  Unfortunately   
   > is_pod() is a little too restrictive - Foo is rather simple, but by   
   > just having any constructor, it is no longer POD (I need some non-   
   > default constructors for convenience).   
      
   I think you want has_trivial_default_constructor<>   
      
   HTH,   
      
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   Dave Abrahams   
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