gistfile1.txt

void*
static_resource::
do_allocate(
    std::size_t n,
    std::size_t align)
{
    auto const i = reinterpret_cast<
        std::uintptr_t>(buffer_ + used_);
    std::size_t const extra = (
        align * ((i + align - 1) / align)) - i;
    auto const avail = size_ - used_;
    if( extra > avail ||
        n > avail ||
        n > avail - extra)
        BOOST_THROW_EXCEPTION(
            std::bad_alloc());
    auto p = buffer_ + used_ + extra;
    used_ += extra + n;
    return p;
}