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Specialize gsl::at for span

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span being a view and not a container, the generic version of gsl::at is not valid any more for span.
This commits adds a specialization of gsl::at for span
This commit is contained in:
ericLemanissier 2016-08-23 10:30:06 +02:00
parent 93b3258e36
commit 134f2db5d9
2 changed files with 15 additions and 0 deletions
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8
gsl/span
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@ -653,6 +653,14 @@ as_writeable_bytes(span<ElementType, Extent> s) noexcept
return {reinterpret_cast<byte*>(s.data()), s.size_bytes()}; return {reinterpret_cast<byte*>(s.data()), s.size_bytes()};
} }
// Specialization of gsl::at for span
template <class ElementType, std::ptrdiff_t Extent>
constexpr ElementType& at(const span<ElementType ,Extent>& s, size_t index)
{
// No bounds checking here because it is done in span::operator[] called below
return s[index];
}
} // namespace gsl } // namespace gsl
#ifdef _MSC_VER #ifdef _MSC_VER

7
tests/span_tests.cpp
View File

@ -1354,6 +1354,13 @@ SUITE(span_tests)
CHECK(match[0].first == f_it); CHECK(match[0].first == f_it);
CHECK(match[0].second == (f_it + 1)); CHECK(match[0].second == (f_it + 1));
} }
TEST(interop_with_gsl_at)
{
int arr[5] = {1, 2, 3, 4, 5};
span<int> s{arr};
CHECK(at(s,0) == 1 && at(s,1) == 2);
}
} }
int main(int, const char* []) { return UnitTest::RunAllTests(); } int main(int, const char* []) { return UnitTest::RunAllTests(); }