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 // constexpr index_type size() const noexcept; 15 // 16 17 18 #include <span> 19 #include <cassert> 20 #include <string> 21 22 #include "test_macros.h" 23 24 25 template <typename Span> 26 constexpr bool testConstexprSpan(Span sp, ptrdiff_t sz) 27 { 28 ASSERT_NOEXCEPT(sp.size()); 29 return sp.size() == sz; 30 } 31 32 33 template <typename Span> 34 void testRuntimeSpan(Span sp, ptrdiff_t sz) 35 { 36 ASSERT_NOEXCEPT(sp.size()); 37 assert(sp.size() == sz); 38 } 39 40 struct A{}; 41 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; 42 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19}; 43 44 int main () 45 { 46 static_assert(testConstexprSpan(std::span<int>(), 0), ""); 47 static_assert(testConstexprSpan(std::span<long>(), 0), ""); 48 static_assert(testConstexprSpan(std::span<double>(), 0), ""); 49 static_assert(testConstexprSpan(std::span<A>(), 0), ""); 50 static_assert(testConstexprSpan(std::span<std::string>(), 0), ""); 51 52 static_assert(testConstexprSpan(std::span<int, 0>(), 0), ""); 53 static_assert(testConstexprSpan(std::span<long, 0>(), 0), ""); 54 static_assert(testConstexprSpan(std::span<double, 0>(), 0), ""); 55 static_assert(testConstexprSpan(std::span<A, 0>(), 0), ""); 56 static_assert(testConstexprSpan(std::span<std::string, 0>(), 0), ""); 57 58 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 1), ""); 59 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 2), ""); 60 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 3), ""); 61 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 4), ""); 62 static_assert(testConstexprSpan(std::span<const int>(iArr1, 5), 5), ""); 63 64 testRuntimeSpan(std::span<int> (), 0); 65 testRuntimeSpan(std::span<long> (), 0); 66 testRuntimeSpan(std::span<double> (), 0); 67 testRuntimeSpan(std::span<A> (), 0); 68 testRuntimeSpan(std::span<std::string>(), 0); 69 70 testRuntimeSpan(std::span<int, 0> (), 0); 71 testRuntimeSpan(std::span<long, 0> (), 0); 72 testRuntimeSpan(std::span<double, 0> (), 0); 73 testRuntimeSpan(std::span<A, 0> (), 0); 74 testRuntimeSpan(std::span<std::string, 0>(), 0); 75 76 testRuntimeSpan(std::span<int>(iArr2, 1), 1); 77 testRuntimeSpan(std::span<int>(iArr2, 2), 2); 78 testRuntimeSpan(std::span<int>(iArr2, 3), 3); 79 testRuntimeSpan(std::span<int>(iArr2, 4), 4); 80 testRuntimeSpan(std::span<int>(iArr2, 5), 5); 81 82 testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1), 1); 83 testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2), 2); 84 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), 3); 85 testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4), 4); 86 testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5), 5); 87 88 std::string s; 89 testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0), 0); 90 testRuntimeSpan(std::span<std::string>(&s, 1), 1); 91 } 92
