mirror of
https://github.com/wuye9036/CppTemplateTutorial.git
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104 lines
3.9 KiB
C++
104 lines
3.9 KiB
C++
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#include <tuple>
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#include <type_traits>
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#include <iostream>
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using std::tuple;
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using std::integral_constant;
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using std::is_same;
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template <int... values> struct to_int_types{
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typedef tuple< integral_constant<int, values>... > type;
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};
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template <typename Pivot> struct Less {
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template <typename X> struct Apply {
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static bool const value = X::value < Pivot::value;
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};
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};
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template <typename Pivot> struct GE {
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template <typename X> struct Apply {
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static bool const value = X::value >= Pivot::value;
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};
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};
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template <typename x, bool realAdd, typename tuple> struct Tuple_PushFront {};
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template <typename x, typename... tupleElems> struct Tuple_PushFront<x, true, tuple<tupleElems...>> {
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typedef tuple<x, tupleElems...> type;
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};
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template <typename x, typename... tupleElems> struct Tuple_PushFront<x, false, tuple<tupleElems...>> {
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typedef tuple<tupleElems...> type;
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};
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template <typename Pred, typename tuple> struct Filter;
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template <typename Pred> struct Filter< Pred, tuple<> > {
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typedef tuple<> type;
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};
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template <typename Pred, typename Head, typename... Ts> struct Filter< Pred, tuple<Head, Ts...> > {
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typedef typename Tuple_PushFront<
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Head, Pred::template Apply<Head>::value, typename Filter<Pred, tuple<Ts...>>::type
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>::type type;
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};
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template <typename... Tuples> struct ConcatenateTuple {};
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template <typename Tuple0> struct ConcatenateTuple<Tuple0> {
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typedef Tuple0 type;
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};
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template <typename Tuple0, typename Tuple1> struct ConcatenateTuple<Tuple0, Tuple1> {
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template <typename TupleA> struct ConcatenateImpl {};
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template <typename... TAs> struct ConcatenateImpl< tuple<TAs...> > {
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template <typename TupleB> struct Apply;
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template <typename... TBs> struct Apply< tuple<TBs...> > {
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typedef tuple<TAs..., TBs...> type;
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};
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};
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typedef typename ConcatenateImpl<Tuple0>::template Apply<Tuple1>::type type;
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};
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template <typename FirstTuple, typename... Follows> struct ConcatenateTuple<FirstTuple, Follows...> {
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typedef typename ConcatenateTuple<
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FirstTuple, typename ConcatenateTuple<Follows...>::type
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>::type type;
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};
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template <typename tuple> struct QuickSort {};
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template <> struct QuickSort< tuple< > > { typedef tuple< > type; };
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template <typename T0> struct QuickSort< tuple<T0> > { typedef tuple<T0> type; };
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template <typename Head, typename... Ts>
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struct QuickSort< tuple<Head, Ts...> > {
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typedef typename Filter< Less<Head>, tuple<Ts...> >::type LeftElems;
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typedef typename Filter< GE <Head>, tuple<Ts...> >::type RightElems;
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typedef typename ConcatenateTuple<
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typename QuickSort<LeftElems>::type, tuple<Head>, typename QuickSort<RightElems>::type
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>::type type;
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};
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void StaticTest()
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{
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typedef to_int_types<1, 2, 3>::type lst_1_3;
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typedef to_int_types<3, 2, 1>::type lst_3_1;
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typedef to_int_types<3, 7, 1, 6, 5, 22, 5>::type lst;
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typedef integral_constant<int, 1>::type i1;
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typedef integral_constant<int, 2>::type i2;
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typedef integral_constant<int, 3>::type i3;
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static_assert(Less<i2>::Apply<i1>::value == true, "");
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static_assert(Less<i1>::Apply<i1>::value == false, "");
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static_assert(Less<i1>::Apply<i2>::value == false, "");
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static_assert(GE<i2>::Apply<i3>::value == true, "");
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static_assert(GE<i2>::Apply<i2>::value == true, "");
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static_assert(GE<i3>::Apply<i2>::value == false, "");
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static_assert(is_same<Tuple_PushFront<i1, true, tuple<i2>>::type, tuple<i1, i2>>::value, "");
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static_assert(is_same<Tuple_PushFront<i2, true, tuple<i1>>::type, tuple<i2, i1>>::value, "");
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static_assert(is_same<Tuple_PushFront<i2, false, tuple<i1>>::type, tuple<i1>>::value, "");
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static_assert(is_same<Filter<Less<i2>, lst_1_3>::type, tuple<i1>>::value, "");
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static_assert(is_same<QuickSort<lst_1_3 >::type, lst_1_3>::value, "");
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static_assert(is_same<QuickSort<lst_3_1 >::type, lst_1_3>::value, "");
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static_assert(is_same<QuickSort<tuple<> >::type, tuple<>>::value, "");
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static_assert(is_same<QuickSort<tuple<i1>>::type, tuple<i1>>::value, "");
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}
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