[Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should

[rguenth at gcc dot gnu dot org]

------- Comment #95 from rguenth at gcc dot gnu dot org  2007-05-18 20:55 -------
But construction/initialization of uninitalized memory in <memory> happens with
placement new!  So we're back to square one.  What this PR initially was about
is a fixed type memory allocator in C++ which needs to change memory from
allocated type T to free-space-managing-structure S at deallocation time and
the other way around at allocation time.  We absolutely _have_ to handle
this case correct.  And we need to optimize the <memory> routines that use
placement new, because they resemble patterns used in libraries like POOMA
or Boost.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286