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Add a comment explaining the one-time allocation in error_category_impl.hpp. Fixes #78.

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Peter Dimov
2022-03-18 08:11:16 +02:00
parent adb9fc54cb
commit 0a9266ea7e
1 changed files with 13 additions and 0 deletions
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13
include/boost/system/detail/error_category_impl.hpp
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@ -143,6 +143,19 @@ inline error_category::operator std::error_category const & () const
return *p;
}
// One `std_category` object is allocated for every
// user-defined `error_category` that is converted to
// `std::error_category`.
//
// This one-time allocation will show up on leak checkers.
// That's unavoidable. There is no way to deallocate the
// `std_category` object because first, `error_category`
// is a literal type (so it can't have a destructor) and
// second, `error_category` needs to be usable during program
// shutdown.
//
// https://github.com/boostorg/system/issues/78
detail::std_category* q = new detail::std_category( this, 0 );
if( ps_.compare_exchange_strong( p, q, std::memory_order_release, std::memory_order_acquire ) )