Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::container::uses_allocator
// In header: <boost/container/uses_allocator.hpp> template<typename T, typename Allocator> struct uses_allocator : public dtl::uses_allocator_imp< T, Allocator > { };
Remark: Automatically detects whether T has a nested allocator_type that is convertible from Allocator. Meets the BinaryTypeTrait requirements ([meta.rqmts] 20.4.1). A program may specialize this type to define uses_allocator<X>::value as true for a T of user-defined type if T does not have a nested allocator_type but is nonetheless constructible using the specified Allocator where either: the first argument of a constructor has type allocator_arg_t and the second argument has type Alloc or the last argument of a constructor has type Alloc.
Result: uses_allocator<T, Allocator>::value== true if a type T::allocator_type exists and either is_convertible<Alloc, T::allocator_type>::value != false or T::allocator_type is an alias erased_type. False otherwise.