struct preallocated {
    void        *   sp;
    std::size_t     size;
    stack_context   sctx;

    preallocated( void * sp, std:size_t size, stack_allocator sctx) noexcept;
};

Constructor

preallocated( void * sp, std:size_t size, stack_allocator sctx) noexcept;