[Boost-bugs] [Boost C++ Libraries] #13163: boost::detail::heap_new does not have a variadic variant

Subject: [Boost-bugs] [Boost C++ Libraries] #13163: boost::detail::heap_new does not have a variadic variant
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-08-15 19:30:52

#13163: boost::detail::heap_new does not have a variadic variant
 Reporter: dean.browning@… | Owner: (none)
     Type: Bugs | Status: new
Milestone: To Be Determined | Component: None
  Version: Boost 1.64.0 | Severity: Problem
 Keywords: |
 Locally, we had code that previously built in CentOS 6.x, using a compiler
 circa from 2009 that does not support variadic templates / rvalue

 gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18)
 Copyright (C) 2010 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions. There is NO

 Without variadic templates / rvalue references boost provides a
 boost::thread's variable argument constructor that supports up to 9
 arguments + thread main. Sadly, the variadic implementation that is
 enabled when rvalue references + variadic arguments are supported is:
         template<typename F, class ...ArgTypes>
         static inline detail::thread_data_ptr
 make_thread_info(BOOST_THREAD_RV_REF(F) f,
 BOOST_THREAD_RV_REF(ArgTypes)... args)
             return detail::thread_data_ptr(detail::heap_new<
 boost::remove_reference<F>::type, ArgTypes...>

 In turn, this calls into the platform specific version of heap_new, which
 currently only supports up to a total of 4 arguments. Locally, I have
 modified my boost version (e.g.
 boost/thread/pthread/thread_heap_alloc.hpp) to have this definition:

         template<typename T,typename... Args>
         inline T* heap_new(Args&&... args)
             return new T(static_cast<Args&&>(args)...);

 While this is functional for my needs, obviously I think it (or something
 like it) should get into boost proper. Moreover, not that it likely
 matters, but it would also be wise to support at least 10 arguments to
 heap_new, in the non-variadic variant, so that it supports the ubiquity of
 other use cases in boost::thread et al.

 A similar implementation should be provided for win32.

Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13163>
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