test/std/containers/sequences/vector/access.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <vector>

//       reference operator[](size_type __i);
// const_reference operator[](size_type __i) const;
//
//       reference at(size_type __i);
// const_reference at(size_type __i) const;
//
//       reference front();
// const_reference front() const;
//
//       reference back();
// const_reference back() const;
// libc++ marks these as 'noexcept' (except 'at')

#include <vector>
#include <cassert>

#include "min_allocator.h"
#include "test_macros.h"

template <class C>
C
make(int size, int start = 0)
{
    C c;
    for (int i = 0; i < size; ++i)
        c.push_back(start + i);
    return c;
}

int main(int, char**)
{
    {
        typedef std::vector<int> C;
        C c = make<C>(10);
        LIBCPP_ASSERT_NOEXCEPT(c[0]);
        LIBCPP_ASSERT_NOEXCEPT(c.front());
        LIBCPP_ASSERT_NOEXCEPT(c.back());
        // at() is NOT noexcept
        ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
        ASSERT_SAME_TYPE(C::reference, decltype(c.at(0)));
        ASSERT_SAME_TYPE(C::reference, decltype(c.front()));
        ASSERT_SAME_TYPE(C::reference, decltype(c.back()));
        for (int i = 0; i < 10; ++i)
            assert(c[i] == i);
        for (int i = 0; i < 10; ++i)
            assert(c.at(i) == i);
        assert(c.front() == 0);
        assert(c.back() == 9);
    }
    {
        typedef std::vector<int> C;
        const int N = 5;
        const C c = make<C>(10, N);
        LIBCPP_ASSERT_NOEXCEPT(c[0]);
        LIBCPP_ASSERT_NOEXCEPT(c.front());
        LIBCPP_ASSERT_NOEXCEPT(c.back());
        // at() is NOT noexcept
        ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));
        ASSERT_SAME_TYPE(C::const_reference, decltype(c.at(0)));
        ASSERT_SAME_TYPE(C::const_reference, decltype(c.front()));
        ASSERT_SAME_TYPE(C::const_reference, decltype(c.back()));
        for (int i = 0; i < 10; ++i)
            assert(c[i] == N + i);
        for (int i = 0; i < 10; ++i)
            assert(c.at(i) == N + i);
        assert(c.front() == N);
        assert(c.back() == N + 9);
    }
#if TEST_STD_VER >= 11
    {
        typedef std::vector<int, min_allocator<int>> C;
        const int N = 34;
        C c = make<C>(10, N);
        LIBCPP_ASSERT_NOEXCEPT(c[0]);
        LIBCPP_ASSERT_NOEXCEPT(c.front());
        LIBCPP_ASSERT_NOEXCEPT(c.back());
        // at() is NOT noexcept
        ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
        ASSERT_SAME_TYPE(C::reference, decltype(c.at(0)));
        ASSERT_SAME_TYPE(C::reference, decltype(c.front()));
        ASSERT_SAME_TYPE(C::reference, decltype(c.back()));
        for (int i = 0; i < 10; ++i)
            assert(c[i] == N + i);
        for (int i = 0; i < 10; ++i)
            assert(c.at(i) == N + i);
        assert(c.front() == N);
        assert(c.back() == N + 9);
    }
    {
        typedef std::vector<int, min_allocator<int>> C;
        const int N = 23;
        const C c = make<C>(10, N);
        LIBCPP_ASSERT_NOEXCEPT(c[0]);
        LIBCPP_ASSERT_NOEXCEPT(c.front());
        LIBCPP_ASSERT_NOEXCEPT(c.back());
        // at() is NOT noexcept
        ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));
        ASSERT_SAME_TYPE(C::const_reference, decltype(c.at(0)));
        ASSERT_SAME_TYPE(C::const_reference, decltype(c.front()));
        ASSERT_SAME_TYPE(C::const_reference, decltype(c.back()));
        for (int i = 0; i < 10; ++i)
            assert(c[i] == N + i);
        for (int i = 0; i < 10; ++i)
            assert(c.at(i) == N + i);
        assert(c.front() == N);
        assert(c.back() == N + 9);
    }
#endif

  return 0;
}