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    CWG Issue 521</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
<HR>
<A NAME="521"></A><H4>521.
  
Requirements for exceptions thrown by allocation functions
</H4>
<B>Section: </B>6.8.6.5.2&#160; [<A href="https://wg21.link/basic.stc.dynamic.allocation">basic.stc.dynamic.allocation</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD1
 &#160;&#160;&#160;

 <B>Submitter: </B>Alisdair Meredith
 &#160;&#160;&#160;

 <B>Date: </B>22 May 2005<BR>


<P>[Voted into WP at the October, 2006 meeting.]</P>

<P>According to 6.8.6.5.2 [<A href="https://wg21.link/basic.stc.dynamic.allocation#3">basic.stc.dynamic.allocation</A>] paragraph 3,</P>

<BLOCKQUOTE>

Any other allocation function that fails to allocate storage shall
only indicate failure by throwing an exception of
class <TT>std::bad_alloc</TT> (17.6.4.1 [<A href="https://wg21.link/bad.alloc">bad.alloc</A>]) or a
class derived from <TT>std::bad_alloc</TT>.

</BLOCKQUOTE>

<P>Shouldn't this statement have the usual requirements for an
unambiguous and accessible base class?</P>

<P><B>Proposed resolution (April, 2006):</B></P>

<P>Change the last sentence of 6.8.6.5.2 [<A href="https://wg21.link/basic.stc.dynamic.allocation#3">basic.stc.dynamic.allocation</A>] paragraph 3
as indicated:</P>

<BLOCKQUOTE>

Any other allocation function that fails to allocate storage shall
<DEL>only</DEL> indicate failure <INS>only</INS> by throwing an exception of
<DEL>class <TT>std::bad_alloc</TT> (17.6.4.1 [<A href="https://wg21.link/bad.alloc">bad.alloc</A>]) or a
class derived from <TT>std::bad_alloc</TT></DEL> <INS>a type that would
match a handler (14.4 [<A href="https://wg21.link/except.handle">except.handle</A>]) of type
<TT>std::bad_alloc</TT> (17.6.4.1 [<A href="https://wg21.link/bad.alloc">bad.alloc</A>])</INS>.

</BLOCKQUOTE>

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