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120 lines
4.1 KiB
C++
120 lines
4.1 KiB
C++
// -*- 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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// constexpr reference operator[](index_type idx) const;
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// constexpr reference operator()(index_type idx) const;
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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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template <typename Span>
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constexpr bool testConstexprSpan(Span sp, ptrdiff_t idx)
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{
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_LIBCPP_ASSERT(noexcept(sp[idx]), "");
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_LIBCPP_ASSERT(noexcept(sp(idx)), "");
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typename Span::reference r1 = sp[idx];
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typename Span::reference r2 = sp(idx);
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typename Span::reference r3 = *(sp.data() + idx);
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return r1 == r2 && r2 == r3;
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}
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template <typename Span>
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void testRuntimeSpan(Span sp, ptrdiff_t idx)
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{
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_LIBCPP_ASSERT(noexcept(sp[idx]), "");
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_LIBCPP_ASSERT(noexcept(sp(idx)), "");
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typename Span::reference r1 = sp[idx];
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typename Span::reference r2 = sp(idx);
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typename Span::reference r3 = *(sp.data() + idx);
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assert(r1 == r2 && r2 == r3);
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}
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struct A{};
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constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
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int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
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int main ()
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{
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 0), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 0), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 1), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 0), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 1), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 2), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 0), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 1), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 2), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 3), "");
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static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), 0), "");
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static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 0), "");
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static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 1), "");
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static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 0), "");
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static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 1), "");
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static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 2), "");
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static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 0), "");
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static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 1), "");
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static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 2), "");
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static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 3), "");
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testRuntimeSpan(std::span<int>(iArr2, 1), 0);
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testRuntimeSpan(std::span<int>(iArr2, 2), 0);
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testRuntimeSpan(std::span<int>(iArr2, 2), 1);
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testRuntimeSpan(std::span<int>(iArr2, 3), 0);
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testRuntimeSpan(std::span<int>(iArr2, 3), 1);
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testRuntimeSpan(std::span<int>(iArr2, 3), 2);
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testRuntimeSpan(std::span<int>(iArr2, 4), 0);
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testRuntimeSpan(std::span<int>(iArr2, 4), 1);
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testRuntimeSpan(std::span<int>(iArr2, 4), 2);
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testRuntimeSpan(std::span<int>(iArr2, 4), 3);
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testRuntimeSpan(std::span<int, 1>(iArr2, 1), 0);
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testRuntimeSpan(std::span<int, 2>(iArr2, 2), 0);
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testRuntimeSpan(std::span<int, 2>(iArr2, 2), 1);
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testRuntimeSpan(std::span<int, 3>(iArr2, 3), 0);
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testRuntimeSpan(std::span<int, 3>(iArr2, 3), 1);
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testRuntimeSpan(std::span<int, 3>(iArr2, 3), 2);
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testRuntimeSpan(std::span<int, 4>(iArr2, 4), 0);
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testRuntimeSpan(std::span<int, 4>(iArr2, 4), 1);
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testRuntimeSpan(std::span<int, 4>(iArr2, 4), 2);
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testRuntimeSpan(std::span<int, 4>(iArr2, 4), 3);
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std::string s;
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testRuntimeSpan(std::span<std::string> (&s, 1), 0);
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testRuntimeSpan(std::span<std::string, 1>(&s, 1), 0);
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}
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