mfbt/tests/TestScopeExit.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/Assertions.h"
   8 #include "mozilla/ScopeExit.h"
   9
  10 using mozilla::MakeScopeExit;
  11
  12 #define CHECK(c)                                       \
  13   do {                                                 \
  14     bool cond = !!(c);                                 \
  15     MOZ_RELEASE_ASSERT(cond, "Failed assertion: " #c); \
  16     if (!cond) {                                       \
  17       return false;                                    \
  18     }                                                  \
  19   } while (false)
  20
  21 static bool Test() {
  22   int a = 1;
  23   int b = 1;
  24   int c = 1;
  25
  26   {
  27     a++;
  28     auto guardA = MakeScopeExit([&] { a--; });
  29
  30     b++;
  31     auto guardB = MakeScopeExit([&] { b--; });
  32
  33     guardB.release();
  34
  35     c++;
  36     auto guardC = MakeScopeExit([&] { c--; });
  37
  38     { auto guardC_ = std::move(guardC); }
  39
  40     CHECK(c == 1);
  41   }
  42
  43   CHECK(a == 1);
  44   CHECK(b == 2);
  45   CHECK(c == 1);
  46
  47   return true;
  48 }
  49
  50 int main() {
  51   if (!Test()) {
  52     return 1;
  53   }
  54   return 0;
  55 }