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Consider updating Allocator Access to add rvalue reference overloads #156
Description
Right now most of allocator access takes the allocator by lvalue reference.
I presume this is to support stateful allocators.
Instead, I purport that allocator access should also work with temporarily materialized allocators.
This is useful in the case where we're rebinding a stored allocator and wishing to do a quick one-off allocation in a single place.
The goal is to remove the need to declare a stack-local, for example.
See the relevant CE example here: https://godbolt.org/z/hqKTGb3ab
Obligatory inline copy:
#include <boost/core/allocator_access.hpp>
#include <memory>
#include <type_traits>
namespace boost
{
template<class A>
allocator_pointer_t<std::decay_t<A>>
allocator_allocate(A&& a, allocator_size_type_t<std::decay_t<A>> n)
{
return allocator_allocate(a,n);
}
}
auto tester(std::allocator<int> a) {
// feed the rebound allocator directly using the converting constructor
//
return boost::allocator_allocate(std::allocator<float>(a),16);
// want to avoid the need to declare `oa` to use the rebound allocator type
//
// std::allocator<float> oa(a);
// return boost::allocator_allocate(oa,16);
}
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