base.h

Go to the documentation of this file.

 
#ifndef NNGN_UTILS_ALLOC_BASE_H
#define NNGN_UTILS_ALLOC_BASE_H
 
#include <cstddef>
 
namespace nngn {
 
struct allocator_opts {
    bool is_always_equal;
};
 
template<typename T, allocator_opts o> struct allocator_base {};
 
template<typename T, allocator_opts o>
bool operator==(const allocator_base<T, o>&, const allocator_base<T, o>&) {
    return o.is_always_equal;
}
 
template<typename T, allocator_opts o>
bool operator!=(const allocator_base<T, o>&, const allocator_base<T, o>&) {
    return !o.is_always_equal;
}
 
template<typename T>
using stateless_allocator = allocator_base<T, /*XXX*/allocator_opts{.is_always_equal = true}>;
 
template<typename T>
using stateful_allocator = allocator_base<T, /*XXX*/allocator_opts{.is_always_equal = false}>;
 
namespace detail {
 
template<typename A>
static constexpr bool has_realloc =
    requires(A a, typename A::pointer p, std::size_t n) {
        a.reallocate(p, n);
    };
 
template<typename A, typename T>
static constexpr bool has_typed_alloc =
    requires(A a, typename A::pointer p, std::size_t n, T t) {
        a.allocate(p, n, t);
    };
 
}
 
}
 
#endif