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// Copyright David Abrahams 2003.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/static_assert.hpp>
#include "static_assert_same.hpp"
#include <boost/iterator/minimum_category.hpp>
struct X { int a; };
struct Xiter : boost::iterator_adaptor<Xiter,X*>
{
Xiter();
Xiter(X* p) : boost::iterator_adaptor<Xiter, X*>(p) {}
};
void take_xptr(X*) {}
void operator_arrow_test()
{
// check that the operator-> result is a pointer for lvalue iterators
X x;
take_xptr(Xiter(&x).operator->());
}
template <class T, class U, class Min>
struct static_assert_min_cat
: static_assert_same<
typename boost::iterators::minimum_category<T,U>::type, Min
>
{};
void category_test()
{
using namespace boost::iterators;
using namespace boost::iterators::detail;
BOOST_STATIC_ASSERT((
!boost::is_convertible<
std::input_iterator_tag
, input_output_iterator_tag>::value));
BOOST_STATIC_ASSERT((
!boost::is_convertible<
std::output_iterator_tag
, input_output_iterator_tag>::value));
BOOST_STATIC_ASSERT((
boost::is_convertible<
input_output_iterator_tag
, std::input_iterator_tag>::value));
BOOST_STATIC_ASSERT((
boost::is_convertible<
input_output_iterator_tag
, std::output_iterator_tag>::value));
#if 0 // This seems wrong; we're not advertising
// input_output_iterator_tag are we?
BOOST_STATIC_ASSERT((
boost::is_convertible<
std::forward_iterator_tag
, input_output_iterator_tag>::value));
#endif
int test = static_assert_min_cat<
std::input_iterator_tag,input_output_iterator_tag, std::input_iterator_tag
>::value;
test = static_assert_min_cat<
input_output_iterator_tag,std::input_iterator_tag, std::input_iterator_tag
>::value;
#if 0
test = static_assert_min_cat<
input_output_iterator_tag,std::forward_iterator_tag, input_output_iterator_tag
>::value;
#endif
test = static_assert_min_cat<
std::input_iterator_tag,std::forward_iterator_tag, std::input_iterator_tag
>::value;
test = static_assert_min_cat<
std::input_iterator_tag,std::random_access_iterator_tag, std::input_iterator_tag
>::value;
#if 0 // This would be wrong: a random access iterator is not
// neccessarily writable, as is an output iterator.
test = static_assert_min_cat<
std::output_iterator_tag,std::random_access_iterator_tag, std::output_iterator_tag
>::value;
#endif
(void)test;
}
int main()
{
category_test();
operator_arrow_test();
return 0;
}
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