https://llvm.org/bugs/show_bug.cgi?id=24075
Bug ID: 24075
Summary: scoped_allocator_adaptor lacks the std::pair
construct() overloads!
Product: libc++
Version: 3.6
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The overload that actually gets used is the std::uses_allocator -> false
overload, which just forwards all received arguments into the std::pair
constructor. This will default construct all inner allocators for any
allocator aware containers inside of a std::pair instead of copy constructing
the allocators from the scoped_allocator_adaptor that gets passed to the outer
container.
For example ...
struct Alloc { STATE WHAT NEEDS COPYIN' };
using outer = Alloc<std::pair<char, std::vector<int, Alloc<int>>>>;
using inner = Alloc<int>;
using saa = std::scoped_allocator_adaptor<outer, inner>;
std::vector<
std::pair<char, std::vector<int, Alloc<int>>>,
saa
> vec(saa(outer(123), inner(432)));
vec.emplace_back(); // default constructs the allocator in the pair's
std::vector
// instead of copying from inner(432)
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