C++中可变参数模板怎样为每个参数再套一层模板?

template \u0026lt;typename... Args\u0026gt;void foo_impl(typename Helper\u0026lt;Args\u0026gt;::type... args) { // implement foo here}template \u0026lt;typename... Args\u0026gt;void foo(Args\u0026amp;\u0026amp;... args) { foo_impl\u0026lt;decltype(std::forward\u0026lt;Args\u0026gt;(args))...\u0026gt;(std::forward\u0026lt;Args\u0026gt;(args)...);}
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template \u0026lt;typename ... Args\u0026gt;void foo(typename Helper\u0026lt;Args\u0026gt;::type ... args);


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