File indexing completed on 2021-02-14 14:27:32
0001 #include <iostream >
0002 #include <cassert >
0003 #include <tuple >
0004 #include <array >
0005 #include <utility >
0006
0007 namespace {
0008
0009 struct A {
0010 float chi2;
0011 int n3d;
0012 int nll;
0013 };
0014
0015
0016 constexpr float mvaVal[3] = {-.5,.5,1.};
0017
0018 template<typename T,typename Comp>
0019 inline float cut(T val, const T * cuts, Comp comp) {
0020 for (int i=2; i>=0; --i)
0021 if ( comp(val,cuts[i]) ) return mvaVal[i];
0022 return -1.f;
0023 }
0024
0025
0026
0027 template<typename CutT>
0028 inline float cut(A const & a, CutT const & cuts) {
0029 for (int i=2; i>=0; --i)
0030 if ( std::get<1>(cuts)(std::get<0>(cuts)(a),std::get<2>(cuts)[i]) ) return mvaVal[i];
0031 return -1.f;
0032 }
0033
0034
0035 template<class F, class...Ts, std::size_t...Is>
0036 void for_each_in_tuple(const std::tuple<Ts...> & tuple, F func, std::index_sequence<Is...>){
0037 using expander = int[];
0038 (void)expander { 0, ((void)func(std::get<Is>(tuple)), 0)... };
0039 }
0040
0041 template<class F, class...Ts>
0042 void for_each_in_tuple(const std::tuple<Ts...> & tuple, F func){
0043 for_each_in_tuple(tuple, func, std::make_index_sequence<sizeof...(Ts)>());
0044 }
0045
0046
0047
0048
0049
0050 float applyCuts(A const & a) {
0051 constexpr auto allCuts = std::make_tuple(
0052 std::make_tuple(
0053 [](A const & a) { return a.chi2;},
0054 std::less_equal<>(),
0055 std::array<float,3>{9999.,25.,16.}
0056 ),
0057 std::make_tuple(
0058 [](A const & a) { return a.n3d;},
0059 std::greater_equal<>(),
0060 std::array<int,3>{1,2,3}
0061 )
0062 );
0063 float aret = 1;
0064 for_each_in_tuple(allCuts,[&](auto const & c) { if (aret>-1.f) aret = std::min(aret,cut(a,c));});
0065 return aret;
0066 }
0067
0068 }
0069
0070 int main() {
0071
0072 A a{18.,1,1};
0073
0074 auto cut1 = std::make_tuple(
0075 [](A const & a) { return a.chi2;},
0076 std::less_equal<>(),
0077 std::array<float,3>{9999.,25.,16.}
0078 );
0079 std::cout << std::get<1>(cut1)(std::get<0>(cut1)(a),std::get<2>(cut1)[0]) << std::endl;
0080 std::cout << std::get<1>(cut1)(std::get<0>(cut1)(a),std::get<2>(cut1)[2]) << std::endl;
0081
0082
0083 std::cout << applyCuts(a) << std::endl;
0084
0085
0086 float maxChi2[3] ={9999.,25.,16.};
0087 int min3DLayers[3] = {1,2,3};
0088 int maxLostLayers[3] = {99,3,3};
0089
0090
0091 float ret = -1.f;
0092 ret = cut(2.f,maxChi2,std::less_equal<>());
0093 assert(ret==mvaVal[2]);
0094 ret = cut(28.f,maxChi2,std::less_equal<>());
0095 assert(ret==mvaVal[0]);
0096
0097 ret = cut(0,min3DLayers,std::greater_equal<>());
0098 assert(ret==-1);
0099 ret = cut(1,min3DLayers,std::greater_equal<>());
0100 assert(ret==mvaVal[0]);
0101 ret = cut(2,min3DLayers,std::greater_equal<>());
0102 assert(ret==mvaVal[1]);
0103 ret = cut(3,min3DLayers,std::greater_equal<>());
0104 assert(ret==mvaVal[2]);
0105 ret = cut(5,min3DLayers,std::greater_equal<>());
0106 assert(ret==mvaVal[2]);
0107
0108 ret = cut(1,maxLostLayers,std::less_equal<>());
0109 assert(ret==mvaVal[2]);
0110
0111 return 0;
0112
0113 }
