http://llvm.org/bugs/show_bug.cgi?id=20460
Bug ID: 20460
Summary: [C++11] allocate_shared should not require rebind of
an allocator
Product: libc++
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The sample code below should be compiled successfully.
================================================================
#include <memory>
template <typename T>
struct Allocator {
typedef T value_type;
Allocator() = default;
template <typename U>
Allocator(const Allocator<U>&) {}
T* allocate(size_t n) {
return static_cast<T*>(::operator new(sizeof(T) * n));
}
void deallocate(T* p, size_t) {
::operator delete(static_cast<void*>(p));
}
};
template <typename T, typename U>
bool operator==(const Allocator<T>&, const Allocator<U>&)
{
return true;
}
template <typename T, typename U>
bool operator!=(const Allocator<T>&, const Allocator<U>&)
{
return false;
}
int main()
{
auto p = std::allocate_shared<int>(Allocator<int>());
}
================================================================
This sample is compiled successfully if the custom allocator Allocator has a
rebind template.
According to C++11 standard 17.6.3.5 Allocator requirements
[allocator.requirements], a rebind template is not required for a custom
allocator.
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