зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1677092: add `constexpr` `AnyOf`. r=sg
The STL supports it only with C++20. Differential Revision: https://phabricator.services.mozilla.com/D97123
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@ -28,6 +28,18 @@ constexpr bool AllOf(Iter aFirst, Iter aLast, Pred aPred) {
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return true;
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}
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// Like C++20's `std::any_of`.
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template <typename Iter, typename Pred>
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constexpr bool AnyOf(Iter aFirst, Iter aLast, Pred aPred) {
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for (; aFirst != aLast; ++aFirst) {
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if (aPred(*aFirst)) {
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return true;
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}
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}
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return false;
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}
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namespace detail {
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template <typename Transform, typename SrcIter>
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using ArrayElementTransformType = typename std::invoke_result_t<
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@ -7,13 +7,16 @@
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#include "mozilla/Algorithm.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Assertions.h"
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#include <array>
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#include <iterator>
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static constexpr bool even(int32_t n) { return !(n & 1); }
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static constexpr bool odd(int32_t n) { return (n & 1); }
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void TestAllOf() {
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using namespace mozilla;
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void TestAllOf() {
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using std::begin;
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using std::end;
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@ -36,7 +39,29 @@ void TestAllOf() {
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static_assert(!AllOf(arr3, arr3 + ArrayLength(arr3), odd), "3-2");
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}
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void TestAnyOf() {
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using std::begin;
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using std::end;
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constexpr std::array<int32_t, 0> arr1{};
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static_assert(!AnyOf(begin(arr1), end(arr1), even));
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static_assert(!AnyOf(begin(arr1), end(arr1), odd));
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constexpr int32_t arr2[] = {1};
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static_assert(!AnyOf(begin(arr2), end(arr2), even));
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static_assert(AnyOf(begin(arr2), end(arr2), odd));
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constexpr int32_t arr3[] = {2};
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static_assert(AnyOf(begin(arr3), end(arr3), even));
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static_assert(!AnyOf(begin(arr3), end(arr3), odd));
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constexpr int32_t arr4[] = {1, 2};
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static_assert(AnyOf(begin(arr4), end(arr4), even));
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static_assert(AnyOf(begin(arr4), end(arr4), odd));
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}
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int main() {
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TestAllOf();
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TestAnyOf();
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return 0;
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}
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