libcxx/test/std/containers/sequences/forwardlist/forwardlist.access/front.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <forward_list>

// reference       front();
// const_reference front() const;

#include <forward_list>
#include <cassert>
#include <iterator>

#include "min_allocator.h"

int main()
{
    {
        typedef int T;
        typedef std::forward_list<T> C;
        const T t[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        C c(std::begin(t), std::end(t));
        assert(c.front() == 0);
        c.front() = 10;
        assert(c.front() == 10);
        assert(*c.begin() == 10);
    }
    {
        typedef int T;
        typedef std::forward_list<T> C;
        const T t[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        const C c(std::begin(t), std::end(t));
        assert(c.front() == 0);
        assert(*c.begin() == 0);
    }
#if __cplusplus >= 201103L
    {
        typedef int T;
        typedef std::forward_list<T, min_allocator<T>> C;
        const T t[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        C c(std::begin(t), std::end(t));
        assert(c.front() == 0);
        c.front() = 10;
        assert(c.front() == 10);
        assert(*c.begin() == 10);
    }
    {
        typedef int T;
        typedef std::forward_list<T, min_allocator<T>> C;
        const T t[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        const C c(std::begin(t), std::end(t));
        assert(c.front() == 0);
        assert(*c.begin() == 0);
    }
#endif
}