forked from boostorg/container
Giuseppe D'Angelo
b694ada294
"POD" is the wrong type trait to determine if something can be safely
zero-filled in order to achieve zero initialization. Consider a type
like
struct POD { int POD::*ptr; };
This is a POD; its value initialization needs to value initialize the
member, and since it's a pointer, that's zero initialization, and that's
setting the pointer to null.
On Itanium, a null pointer to data member is not zero filled; it actually
has the value -1u.
Hence, zero-filling via memset(0) a POD object like the one above is
erroneous. Unfortunately there is no type trait in C++ that we can use to
know if a given datatype can be value initialized by zero-filling -- we
can check for trivial constructability, but that's a necessary
condition, not a sufficient one (POD above is also trivially
constructible).
The test is disabled on MSVC because of a compiler bug.
Fixes #238
Boost.Container
Boost.Container, part of collection of the Boost C++ Libraries, implements several well-known containers, including STL containers. The aim of the library is to offer advanced features not present in standard containers, to offer the latest standard draft features for compilers that don't comply with the latest C++ standard and to offer useful non-STL containers.
License
Distributed under the Boost Software License, Version 1.0.
Properties
- C++03
- Mostly header-only, library compilation is required for few features.
- Supports compiler modes without exceptions support (e.g.
-fno-exceptions).
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