Method alloc_dynamic

src/opr/test/cond.cpp:455–465

public:
    void alloc_dynamic(VarNode* var, DeviceTensorStorage& dest, size_t size) override {
        ASSERT_LT(dest.size(), size);
        ++m_nr_alive;
        auto ptr = dest.comp_node().alloc_device(size);
        auto del = [this, cn = dest.comp_node()](void* ptr) {
            cn.free_device(ptr);
            auto nr = m_nr_alive.fetch_sub(1);
            ASSERT_GT(nr, 0u);
        };
        dest.reset(dest.comp_node(), size, {static_cast<dt_byte*>(ptr), del});
    }

    size_t nr_alive() const { return m_nr_alive; }