1 // { dg-options -std=c++0x } 2 // { dg-do run } 3 4 namespace xstd { 5 6 typedef decltype(sizeof(char)) size_t; 7 8 template<class E> 9 class initializer_list { 10 private: 11 size_t sz; 12 const E* start; 13 14 public: 15 typedef E value_type; 16 typedef const E& reference; 17 typedef const E& const_reference; 18 typedef size_t size_type; 19 typedef const E* iterator; 20 typedef const E* const_iterator; 21 initializer_list()22 constexpr initializer_list() : sz(), start(nullptr) {} 23 24 template<size_t N> initializer_list(const E (& array)[N])25 constexpr initializer_list(const E(&array)[N]) : sz(N), start(array) {} 26 size()27 constexpr size_t size() { return sz; } 28 begin()29 constexpr const E* begin() { return start; } 30 end()31 constexpr const E* end() { return start + sz; } 32 }; 33 34 template<class E, size_t N> make_list(const E (& array)[N])35constexpr initializer_list<E> make_list(const E(&array)[N]) { 36 return initializer_list<E>(array); 37 } 38 39 template<class E> min(initializer_list<E> list)40E min(initializer_list<E> list) 41 { 42 // static_assert(list.size() > 0, "Invalid list"); 43 auto it = list.begin(); 44 E result = *it; 45 for (++it; it != list.end(); ++it) { 46 if (*it < result) { 47 result = *it; 48 } 49 } 50 return result; 51 } 52 53 } 54 55 constexpr int global_i[] = {2, 4, -5, 6, 10}; 56 constexpr xstd::initializer_list<int> list(global_i); 57 #define SA(X) static_assert(X, #X) 58 SA(list.size() == 5); 59 SA(list.begin()[2] == -5); 60 SA(list.end()[-1] == 10); 61 main()62int main() { 63 if (xstd::min(xstd::make_list(global_i)) != -5) 64 return 1; 65 } 66