libcxx/test/std/strings/basic.string/string.starts_with/starts_with.ptr.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
   9
  10 // <string>
  11
  12 // constexpr bool starts_with(const CharT *x) const;
  13
  14 #include <string>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 template <class S>
  20 constexpr void test_string() {
  21   const char* s = "abcde";
  22   S s0{};
  23   S s1{s, 1};
  24   S s2{s, 2};
  25   //     S  s3 { s, 3 };
  26   //     S  s4 { s, 4 };
  27   //     S  s5 { s, 5 };
  28   S sNot{"def", 3};
  29
  30   LIBCPP_ASSERT_NOEXCEPT(s0.starts_with(""));
  31
  32   assert(s0.starts_with(""));
  33   assert(!s0.starts_with("a"));
  34
  35   assert(s1.starts_with(""));
  36   assert(s1.starts_with("a"));
  37   assert(!s1.starts_with("ab"));
  38   assert(!s1.starts_with("abc"));
  39   assert(!s1.starts_with("abcd"));
  40   assert(!s1.starts_with("abcde"));
  41   assert(!s1.starts_with("def"));
  42
  43   assert(s2.starts_with(""));
  44   assert(s2.starts_with("a"));
  45   assert(s2.starts_with("ab"));
  46   assert(!s2.starts_with("abc"));
  47   assert(!s2.starts_with("abcd"));
  48   assert(!s2.starts_with("abcde"));
  49   assert(!s2.starts_with("def"));
  50
  51   assert(sNot.starts_with(""));
  52   assert(!sNot.starts_with("a"));
  53   assert(!sNot.starts_with("ab"));
  54   assert(!sNot.starts_with("abc"));
  55   assert(!sNot.starts_with("abcd"));
  56   assert(!sNot.starts_with("abcde"));
  57   assert(sNot.starts_with("def"));
  58 }
  59
  60 constexpr bool test() {
  61   test_string<std::string>();
  62
  63   return true;
  64 }
  65
  66 int main(int, char**) {
  67   test();
  68   static_assert(test());
  69
  70   return 0;
  71 }