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      1 // -*- C++ -*-
      2 //===------------------------------ span ---------------------------------===//
      3 //
      4 //                     The LLVM Compiler Infrastructure
      5 //
      6 // This file is dual licensed under the MIT and the University of Illinois Open
      7 // Source Licenses. See LICENSE.TXT for details.
      8 //
      9 //===---------------------------------------------------------------------===//
     10 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
     11 
     12 // <span>
     13 
     14 // template <class ElementType, ptrdiff_t Extent>
     15 //     span<const byte,
     16 //          Extent == dynamic_extent
     17 //              ? dynamic_extent
     18 //              : static_cast<ptrdiff_t>(sizeof(ElementType)) * Extent>
     19 //     as_bytes(span<ElementType, Extent> s) noexcept;
     20 
     21 
     22 #include <span>
     23 #include <cassert>
     24 #include <string>
     25 
     26 #include "test_macros.h"
     27 
     28 template<typename Span>
     29 void testRuntimeSpan(Span sp)
     30 {
     31     ASSERT_NOEXCEPT(std::as_bytes(sp));
     32 
     33     auto spBytes = std::as_bytes(sp);
     34     using SB = decltype(spBytes);
     35     ASSERT_SAME_TYPE(const std::byte, typename SB::element_type);
     36 
     37     if (sp.extent == std::dynamic_extent)
     38         assert(spBytes.extent == std::dynamic_extent);
     39     else
     40         assert(spBytes.extent == static_cast<std::ptrdiff_t>(sizeof(typename Span::element_type)) * sp.extent);
     41 
     42     assert((void *) spBytes.data() == (void *) sp.data());
     43     assert(spBytes.size() == sp.size_bytes());
     44 }
     45 
     46 struct A{};
     47 int iArr2[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
     48 
     49 int main ()
     50 {
     51     testRuntimeSpan(std::span<int>        ());
     52     testRuntimeSpan(std::span<long>       ());
     53     testRuntimeSpan(std::span<double>     ());
     54     testRuntimeSpan(std::span<A>          ());
     55     testRuntimeSpan(std::span<std::string>());
     56 
     57     testRuntimeSpan(std::span<int, 0>        ());
     58     testRuntimeSpan(std::span<long, 0>       ());
     59     testRuntimeSpan(std::span<double, 0>     ());
     60     testRuntimeSpan(std::span<A, 0>          ());
     61     testRuntimeSpan(std::span<std::string, 0>());
     62 
     63     testRuntimeSpan(std::span<int>(iArr2, 1));
     64     testRuntimeSpan(std::span<int>(iArr2, 2));
     65     testRuntimeSpan(std::span<int>(iArr2, 3));
     66     testRuntimeSpan(std::span<int>(iArr2, 4));
     67     testRuntimeSpan(std::span<int>(iArr2, 5));
     68 
     69     testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1));
     70     testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2));
     71     testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3));
     72     testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4));
     73     testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5));
     74 
     75     std::string s;
     76     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
     77     testRuntimeSpan(std::span<std::string>(&s, 1));
     78 }
     79