load_factor.pass.cpp (2286B)
1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <unordered_map> 11 12 // template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>, 13 // class Alloc = allocator<pair<const Key, T>>> 14 // class unordered_map 15 16 // float load_factor() const 17 18 #include <unordered_map> 19 #include <string> 20 #include <cassert> 21 #include <cmath> 22 #include <cfloat> 23 24 #include "test_macros.h" 25 #include "min_allocator.h" 26 27 int main() 28 { 29 { 30 typedef std::unordered_map<int, std::string> C; 31 typedef std::pair<int, std::string> P; 32 P a[] = 33 { 34 P(10, "ten"), 35 P(20, "twenty"), 36 P(30, "thirty"), 37 P(40, "forty"), 38 P(50, "fifty"), 39 P(60, "sixty"), 40 P(70, "seventy"), 41 P(80, "eighty"), 42 }; 43 const C c(std::begin(a), std::end(a)); 44 assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON); 45 } 46 { 47 typedef std::unordered_map<int, std::string> C; 48 const C c; 49 assert(c.load_factor() == 0); 50 } 51 #if TEST_STD_VER >= 11 52 { 53 typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>, 54 min_allocator<std::pair<const int, std::string>>> C; 55 typedef std::pair<int, std::string> P; 56 P a[] = 57 { 58 P(10, "ten"), 59 P(20, "twenty"), 60 P(30, "thirty"), 61 P(40, "forty"), 62 P(50, "fifty"), 63 P(60, "sixty"), 64 P(70, "seventy"), 65 P(80, "eighty"), 66 }; 67 const C c(std::begin(a), std::end(a)); 68 assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON); 69 } 70 { 71 typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>, 72 min_allocator<std::pair<const int, std::string>>> C; 73 const C c; 74 assert(c.load_factor() == 0); 75 } 76 #endif 77 }