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Fix #717 - Add empty() to strided_span (#718)

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Stephan Dollberg 2018-08-17 19:47:03 +01:00 committed by Anna Gringauze
parent 55aad0ab6d
commit 86be2366c7
2 changed files with 5 additions and 0 deletions
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2
include/gsl/multi_span
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@ -1931,6 +1931,8 @@ public:
constexpr pointer data() const noexcept { return data_; } constexpr pointer data() const noexcept { return data_; }
constexpr bool empty() const noexcept { return this->size() == 0; }
constexpr explicit operator bool() const noexcept { return data_ != nullptr; } constexpr explicit operator bool() const noexcept { return data_ != nullptr; }
constexpr iterator begin() const { return iterator{this, true}; } constexpr iterator begin() const { return iterator{this, true}; }

3
tests/strided_span_tests.cpp
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@ -67,12 +67,14 @@ TEST_CASE("span_section")
const multi_span<int, 5, 10> av = as_multi_span(multi_span<int>{data}, dim<5>(), dim<10>()); const multi_span<int, 5, 10> av = as_multi_span(multi_span<int>{data}, dim<5>(), dim<10>());
const strided_span<int, 2> av_section_1 = av.section({1, 2}, {3, 4}); const strided_span<int, 2> av_section_1 = av.section({1, 2}, {3, 4});
CHECK(!av_section_1.empty());
CHECK((av_section_1[{0, 0}] == 12)); CHECK((av_section_1[{0, 0}] == 12));
CHECK((av_section_1[{0, 1}] == 13)); CHECK((av_section_1[{0, 1}] == 13));
CHECK((av_section_1[{1, 0}] == 22)); CHECK((av_section_1[{1, 0}] == 22));
CHECK((av_section_1[{2, 3}] == 35)); CHECK((av_section_1[{2, 3}] == 35));
const strided_span<int, 2> av_section_2 = av_section_1.section({1, 2}, {2, 2}); const strided_span<int, 2> av_section_2 = av_section_1.section({1, 2}, {2, 2});
CHECK(!av_section_2.empty());
CHECK((av_section_2[{0, 0}] == 24)); CHECK((av_section_2[{0, 0}] == 24));
CHECK((av_section_2[{0, 1}] == 25)); CHECK((av_section_2[{0, 1}] == 25));
CHECK((av_section_2[{1, 0}] == 34)); CHECK((av_section_2[{1, 0}] == 34));
@ -563,6 +565,7 @@ TEST_CASE("empty_strided_spans")
strided_span<int, 1> empty_sav{empty_av, {0, 1}}; strided_span<int, 1> empty_sav{empty_av, {0, 1}};
CHECK(empty_sav.bounds().index_bounds() == multi_span_index<1>{0}); CHECK(empty_sav.bounds().index_bounds() == multi_span_index<1>{0});
CHECK(empty_sav.empty());
CHECK_THROWS_AS(empty_sav[0], fail_fast); CHECK_THROWS_AS(empty_sav[0], fail_fast);
CHECK_THROWS_AS(empty_sav.begin()[0], fail_fast); CHECK_THROWS_AS(empty_sav.begin()[0], fail_fast);
CHECK_THROWS_AS(empty_sav.cbegin()[0], fail_fast); CHECK_THROWS_AS(empty_sav.cbegin()[0], fail_fast);