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38a6de0fe3
I'm not sure how I tested MOZ_FOR_EACH in bug 1368932, but it turns out it doesn't work with an empty list, despite MOZ_PASTE_PREFIX_AND_ARG_COUNT now supporting 0 arguments. Macros can be tricky, and it ends up being easier to make things work cross-compiler with a separate macro that does the counting, and (re)building MOZ_PASTE_PREFIX_AND_ARG_COUNT on top of that. Then MOZ_FOR_EACH ends up working as expected with an empty list. So this adds a MOZ_ARG_COUNT macro that counts the number of variadic arguments it's given, and derives MOZ_PASTE_PREFIX_AND_ARG_COUNT from it. And this adds a testcase validating that MOZ_FOR_EACH works properly with an empty list as a result. --HG-- extra : rebase_source : 309371d87bd1561fbd2153f44fc1256185045d23
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/MacroArgs.h"
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static_assert(MOZ_ARG_COUNT() == 0, "");
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static_assert(MOZ_ARG_COUNT(a) == 1, "");
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static_assert(MOZ_ARG_COUNT(a, b) == 2, "");
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static_assert(MOZ_ARG_COUNT(a, b, c) == 3, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(100) == 1000, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(100, a) == 1001, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(100, a, b) == 1002, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(100, a, b, c) == 1003, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(, a, b, c) == 3, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(, a) == 1, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(, !a) == 1, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(, (a, b)) == 1, "");
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static_assert(MOZ_PASTE_PREFIX_AND_ARG_COUNT(, MOZ_ARGS_AFTER_1(a, b, c)) == 2,
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"MOZ_ARGS_AFTER_1(a, b, c) should expand to 'b, c'");
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static_assert(MOZ_ARGS_AFTER_2(a, b, 3) == 3,
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"MOZ_ARGS_AFTER_2(a, b, 3) should expand to '3'");
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static_assert(MOZ_ARG_1(10, 20, 30) == 10, "");
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static_assert(MOZ_ARG_2(10, 20, 30) == 20, "");
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int
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main()
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{
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return 0;
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}
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