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124 lines
4.5 KiB
124 lines
4.5 KiB
// -*- C++ -*-
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//===------------------------------ span ---------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===---------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <span>
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// template<size_t N>
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// constexpr span(element_type (&arr)[N]) noexcept;
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//
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// Remarks: These constructors shall not participate in overload resolution unless:
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// — extent == dynamic_extent || N == extent is true, and
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// — remove_pointer_t<decltype(data(arr))>(*)[] is convertible to ElementType(*)[].
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//
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#include <span>
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#include <cassert>
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#include <string>
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#include "test_macros.h"
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void checkCV()
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{
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int arr[] = {1,2,3};
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const int carr[] = {4,5,6};
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volatile int varr[] = {7,8,9};
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const volatile int cvarr[] = {1,3,5};
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// Types the same (dynamic sized)
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{
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std::span< int> s1{ arr}; // a span< int> pointing at int.
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std::span<const int> s2{ carr}; // a span<const int> pointing at const int.
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std::span< volatile int> s3{ varr}; // a span< volatile int> pointing at volatile int.
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std::span<const volatile int> s4{cvarr}; // a span<const volatile int> pointing at const volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 12);
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}
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// Types the same (static sized)
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{
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std::span< int,3> s1{ arr}; // a span< int> pointing at int.
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std::span<const int,3> s2{ carr}; // a span<const int> pointing at const int.
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std::span< volatile int,3> s3{ varr}; // a span< volatile int> pointing at volatile int.
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std::span<const volatile int,3> s4{cvarr}; // a span<const volatile int> pointing at const volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 12);
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}
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// types different (dynamic sized)
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{
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std::span<const int> s1{ arr}; // a span<const int> pointing at int.
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std::span< volatile int> s2{ arr}; // a span< volatile int> pointing at int.
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std::span< volatile int> s3{ arr}; // a span< volatile int> pointing at const int.
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std::span<const volatile int> s4{ arr}; // a span<const volatile int> pointing at int.
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std::span<const volatile int> s5{carr}; // a span<const volatile int> pointing at const int.
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std::span<const volatile int> s6{varr}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18);
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}
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// types different (static sized)
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{
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std::span<const int,3> s1{ arr}; // a span<const int> pointing at int.
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std::span< volatile int,3> s2{ arr}; // a span< volatile int> pointing at int.
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std::span< volatile int,3> s3{ arr}; // a span< volatile int> pointing at const int.
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std::span<const volatile int,3> s4{ arr}; // a span<const volatile int> pointing at int.
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std::span<const volatile int,3> s5{carr}; // a span<const volatile int> pointing at const int.
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std::span<const volatile int,3> s6{varr}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18);
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}
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}
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template <typename T>
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constexpr bool testConstexprSpan()
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{
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constexpr T val[2] = {};
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ASSERT_NOEXCEPT(std::span<const T> {val});
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ASSERT_NOEXCEPT(std::span<const T, 2>{val});
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std::span<const T> s1{val};
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std::span<const T, 2> s2{val};
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return
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s1.data() == &val[0] && s1.size() == 2
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&& s2.data() == &val[0] && s2.size() == 2;
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}
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template <typename T>
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void testRuntimeSpan()
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{
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T val[2] = {};
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ASSERT_NOEXCEPT(std::span<T> {val});
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ASSERT_NOEXCEPT(std::span<T, 2>{val});
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std::span<T> s1{val};
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std::span<T, 2> s2{val};
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assert(s1.data() == &val[0] && s1.size() == 2);
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assert(s2.data() == &val[0] && s2.size() == 2);
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}
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struct A{};
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int main ()
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{
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static_assert(testConstexprSpan<int>(), "");
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static_assert(testConstexprSpan<long>(), "");
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static_assert(testConstexprSpan<double>(), "");
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static_assert(testConstexprSpan<A>(), "");
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testRuntimeSpan<int>();
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testRuntimeSpan<long>();
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testRuntimeSpan<double>();
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testRuntimeSpan<std::string>();
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testRuntimeSpan<A>();
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checkCV();
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}
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