Function _with_alloc

include/stringzilla/stringzilla.hpp:1545–1551

 */
template <typename allocator_type_, typename allocator_callback_>
static status_t _with_alloc(allocator_type_ &allocator, allocator_callback_ &&callback) noexcept {
    sz_memory_allocator_t alloc;
    alloc.allocate = &_call_allocate<allocator_type_>;
    alloc.free = &_call_free<allocator_type_>;
    alloc.handle = &allocator;
    return static_cast<status_t>(callback(alloc));
}

/**
 *  @brief Helper function, wrapping a C++ allocator into a C-style allocator.