Implement <span>. Reviewed as https://reviews.llvm.org/D49338
llvm-svn: 337804
diff --git a/libcxx/test/std/containers/views/span.cons/stdarray.pass.cpp b/libcxx/test/std/containers/views/span.cons/stdarray.pass.cpp
new file mode 100644
index 0000000..204935d
--- /dev/null
+++ b/libcxx/test/std/containers/views/span.cons/stdarray.pass.cpp
@@ -0,0 +1,111 @@
+// -*- C++ -*-
+//===------------------------------ span ---------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===---------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <span>
+
+// template<size_t N>
+// constexpr span(array<value_type, N>& arr) noexcept;
+// template<size_t N>
+// constexpr span(const array<value_type, N>& arr) noexcept;
+//
+// Remarks: These constructors shall not participate in overload resolution unless:
+// — extent == dynamic_extent || N == extent is true, and
+// — remove_pointer_t<decltype(data(arr))>(*)[] is convertible to ElementType(*)[].
+//
+
+
+#include <span>
+#include <cassert>
+#include <string>
+
+#include "test_macros.h"
+
+
+void checkCV()
+{
+ std::array<int, 3> arr = {1,2,3};
+// STL says these are not cromulent
+// std::array<const int,3> carr = {4,5,6};
+// std::array<volatile int, 3> varr = {7,8,9};
+// std::array<const volatile int, 3> cvarr = {1,3,5};
+
+// Types the same (dynamic sized)
+ {
+ std::span< int> s1{ arr}; // a span< int> pointing at int.
+ }
+
+// Types the same (static sized)
+ {
+ std::span< int,3> s1{ arr}; // a span< int> pointing at int.
+ }
+
+
+// types different (dynamic sized)
+ {
+ std::span<const int> s1{ arr}; // a span<const int> pointing at int.
+ std::span< volatile int> s2{ arr}; // a span< volatile int> pointing at int.
+ std::span< volatile int> s3{ arr}; // a span< volatile int> pointing at const int.
+ std::span<const volatile int> s4{ arr}; // a span<const volatile int> pointing at int.
+ }
+
+// types different (static sized)
+ {
+ std::span<const int,3> s1{ arr}; // a span<const int> pointing at int.
+ std::span< volatile int,3> s2{ arr}; // a span< volatile int> pointing at int.
+ std::span< volatile int,3> s3{ arr}; // a span< volatile int> pointing at const int.
+ std::span<const volatile int,3> s4{ arr}; // a span<const volatile int> pointing at int.
+ }
+}
+
+
+template <typename T>
+constexpr bool testConstexprSpan()
+{
+ constexpr std::array<T,2> val = { T(), T() };
+ ASSERT_NOEXCEPT(std::span<const T> {val});
+ ASSERT_NOEXCEPT(std::span<const T, 2>{val});
+ std::span<const T> s1{val};
+ std::span<const T, 2> s2{val};
+ return
+ s1.data() == &val[0] && s1.size() == 2
+ && s2.data() == &val[0] && s2.size() == 2;
+}
+
+
+template <typename T>
+void testRuntimeSpan()
+{
+ std::array<T,2> val;
+ ASSERT_NOEXCEPT(std::span<T> {val});
+ ASSERT_NOEXCEPT(std::span<T, 2>{val});
+ std::span<T> s1{val};
+ std::span<T, 2> s2{val};
+ assert(s1.data() == &val[0] && s1.size() == 2);
+ assert(s2.data() == &val[0] && s2.size() == 2);
+}
+
+struct A{};
+
+int main ()
+{
+ static_assert(testConstexprSpan<int>(), "");
+ static_assert(testConstexprSpan<long>(), "");
+ static_assert(testConstexprSpan<double>(), "");
+ static_assert(testConstexprSpan<A>(), "");
+
+ testRuntimeSpan<int>();
+ testRuntimeSpan<long>();
+ testRuntimeSpan<double>();
+ testRuntimeSpan<std::string>();
+ testRuntimeSpan<A>();
+
+ checkCV();
+}