Crow：Middlewares 庖丁解牛3 pop_back

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紧随着产生序列

Crow：Middlewares 庖丁解牛2 产生序列-CSDN博客

的代码是pop_back:

template<typename Seq, typename Tuple>
struct pop_back_helper;template<unsigned... N, typename Tuple>
struct pop_back_helper<seq<N...>, Tuple>
{template<template<typename... Args> class U>using rebind = U<typename std::tuple_element<N, Tuple>::type...>;
};template<typename... T>
struct pop_back
{template<template<typename... Args> class U>using rebind = typename pop_back_helper<typename gen_seq<sizeof...(T) - 1>::type, std::tuple<T...>>::template rebind<U>;
};template<>
struct pop_back<>
{template<template<typename... Args> class U>u

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