libcxx/test/std/strings/string.conversions/to_string.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <string>
  10
  11 // string to_string(int val);
  12 // string to_string(unsigned val);
  13 // string to_string(long val);
  14 // string to_string(unsigned long val);
  15 // string to_string(long long val);
  16 // string to_string(unsigned long long val);
  17 // string to_string(float val);
  18 // string to_string(double val);
  19 // string to_string(long double val);
  20
  21 #include <string>
  22 #include <cassert>
  23 #include <limits>
  24
  25 #include "parse_integer.h"
  26 #include "test_macros.h"
  27
  28 template <class T>
  29 void
  30 test_signed()
  31 {
  32     {
  33         std::string s = std::to_string(T(0));
  34         assert(s.size() == 1);
  35         assert(s[s.size()] == 0);
  36         assert(s == "0");
  37     }
  38     {
  39         std::string s = std::to_string(T(12345));
  40         assert(s.size() == 5);
  41         assert(s[s.size()] == 0);
  42         assert(s == "12345");
  43     }
  44     {
  45         std::string s = std::to_string(T(-12345));
  46         assert(s.size() == 6);
  47         assert(s[s.size()] == 0);
  48         assert(s == "-12345");
  49     }
  50     {
  51         std::string s = std::to_string(std::numeric_limits<T>::max());
  52         assert(s.size() == std::numeric_limits<T>::digits10 + 1);
  53         T t = parse_integer<T>(s);
  54         assert(t == std::numeric_limits<T>::max());
  55     }
  56     {
  57         std::string s = std::to_string(std::numeric_limits<T>::min());
  58         T t = parse_integer<T>(s);
  59         assert(t == std::numeric_limits<T>::min());
  60     }
  61 }
  62
  63 template <class T>
  64 void
  65 test_unsigned()
  66 {
  67     {
  68         std::string s = std::to_string(T(0));
  69         assert(s.size() == 1);
  70         assert(s[s.size()] == 0);
  71         assert(s == "0");
  72     }
  73     {
  74         std::string s = std::to_string(T(12345));
  75         assert(s.size() == 5);
  76         assert(s[s.size()] == 0);
  77         assert(s == "12345");
  78     }
  79     {
  80         std::string s = std::to_string(std::numeric_limits<T>::max());
  81         assert(s.size() == std::numeric_limits<T>::digits10 + 1);
  82         T t = parse_integer<T>(s);
  83         assert(t == std::numeric_limits<T>::max());
  84     }
  85 }
  86
  87 template <class T>
  88 void
  89 test_float()
  90 {
  91     {
  92         std::string s = std::to_string(T(0));
  93         assert(s.size() == 8);
  94         assert(s[s.size()] == 0);
  95         assert(s == "0.000000");
  96     }
  97     {
  98         std::string s = std::to_string(T(12345));
  99         assert(s.size() == 12);
 100         assert(s[s.size()] == 0);
 101         assert(s == "12345.000000");
 102     }
 103     {
 104         std::string s = std::to_string(T(-12345));
 105         assert(s.size() == 13);
 106         assert(s[s.size()] == 0);
 107         assert(s == "-12345.000000");
 108     }
 109 }
 110
 111 int main(int, char**)
 112 {
 113     test_signed<int>();
 114     test_signed<long>();
 115     test_signed<long long>();
 116     test_unsigned<unsigned>();
 117     test_unsigned<unsigned long>();
 118     test_unsigned<unsigned long long>();
 119     test_float<float>();
 120     test_float<double>();
 121     test_float<long double>();
 122
 123   return 0;
 124 }