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// Range v3 library
//
// Copyright Casey Carter 2016
// Copyright Eric Niebler 2018
//
// Use, modification and distribution is subject to 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)
//
// Project home: https://github.com/ericniebler/range-v3
#include <range/v3/range/access.hpp>
#include <range/v3/range/primitives.hpp>
#include <range/v3/view/subrange.hpp>
#include <range/v3/view/ref.hpp>
#include <range/v3/view/iota.hpp>
#include <range/v3/algorithm/find.hpp>
#include <vector>
#include "../simple_test.hpp"
#if defined(__clang__)
RANGES_DIAGNOSTIC_IGNORE("-Wunused-const-variable")
#endif
void test_range_access_ambiguity()
{
std::vector<ranges::reverse_iterator<int*>> vri{};
using namespace ranges;
(void)begin(vri);
(void)end(vri);
(void)cbegin(vri);
(void)cend(vri);
(void)rbegin(vri);
(void)rend(vri);
(void)crbegin(vri);
(void)crend(vri);
}
void test_initializer_list()
{
std::initializer_list<int> il = {0,1,2};
{
int count = 0;
for(auto p = ranges::begin(il), e = ranges::end(il); p != e; ++p) {
CHECK(*p == count++);
}
}
{
int count = 3;
for(auto p = ranges::rbegin(il), e = ranges::rend(il); p != e; ++p) {
CHECK(*p == --count);
}
}
CHECK(ranges::size(il) == std::size_t{3});
CHECK(ranges::data(il) == &*il.begin());
CHECK(ranges::empty(il) == false);
}
template<class Value, typename T, T... Is>
void test_array(std::integer_sequence<T, Is...>)
{
Value a[sizeof...(Is)] = { Is... };
{
int count = 0;
for(auto p = ranges::begin(a), e = ranges::end(a); p != e; ++p) {
CHECK(*p == count++);
}
}
{
int count = sizeof...(Is);
for(auto p = ranges::rbegin(a), e = ranges::rend(a); p != e; ++p) {
CHECK(*p == --count);
}
}
CHECK(ranges::size(a) == sizeof...(Is));
CHECK(ranges::data(a) == a + 0);
CHECK(ranges::empty(a) == false);
}
namespace begin_testing
{
template<class R>
CPP_requires(can_begin_,
requires(R&& r) //
(
ranges::begin((R &&) r)
));
template<class R>
CPP_concept can_begin =
CPP_requires_ref(can_begin_, R);
template<class R>
CPP_requires(can_cbegin_,
requires(R&& r) //
(
ranges::cbegin((R &&) r)
));
template<class R>
CPP_concept can_cbegin =
CPP_requires_ref(can_cbegin_, R);
struct A
{
int* begin();
int* end();
int const * begin() const;
int const * end() const;
};
struct B : A {};
void* begin(B&);
struct C : A {};
void begin(C&);
struct D : A {};
char* begin(D&);
void test()
{
// Valid
CPP_assert(can_begin<int(&)[2]>);
CPP_assert(ranges::same_as<decltype(ranges::begin(std::declval<int(&)[2]>())), int*>);
CPP_assert(can_begin<int const(&)[2]>);
CPP_assert(ranges::same_as<decltype(ranges::begin(std::declval<int const(&)[2]>())), int const *>);
CPP_assert(can_cbegin<int(&)[2]>);
CPP_assert(ranges::same_as<decltype(ranges::cbegin(std::declval<int(&)[2]>())), int const *>);
CPP_assert(can_cbegin<int const(&)[2]>);
CPP_assert(ranges::same_as<decltype(ranges::cbegin(std::declval<int const(&)[2]>())), int const *>);
#ifndef RANGES_WORKAROUND_MSVC_573728
// Ill-formed: array rvalue
CPP_assert(!can_begin<int(&&)[2]>);
CPP_assert(!can_begin<int const(&&)[2]>);
CPP_assert(!can_cbegin<int(&&)[2]>);
CPP_assert(!can_cbegin<int const(&&)[2]>);
#endif // RANGES_WORKAROUND_MSVC_573728
// Valid: only member begin
CPP_assert(can_begin<A&>);
CPP_assert(!can_begin<A>);
CPP_assert(ranges::same_as<decltype(ranges::begin(std::declval<A&>())), int*>);
CPP_assert(can_begin<const A&>);
CPP_assert(!can_begin<const A>);
CPP_assert(ranges::same_as<decltype(ranges::begin(std::declval<const A&>())), int const *>);
// Valid: Both member and non-member begin, but non-member returns non-Iterator.
CPP_assert(can_begin<B&>);
CPP_assert(!can_begin<B>);
CPP_assert(ranges::same_as<decltype(ranges::begin(std::declval<B&>())), int*>);
CPP_assert(can_begin<const B&>);
CPP_assert(!can_begin<const B>);
CPP_assert(ranges::same_as<decltype(ranges::begin(std::declval<const B&>())), int const *>);
// Valid: Both member and non-member begin, but non-member returns non-Iterator.
CPP_assert(can_begin<C&>);
CPP_assert(!can_begin<C>);
CPP_assert(can_begin<const C&>);
CPP_assert(!can_begin<const C>);
// Valid: Prefer member begin
CPP_assert(can_begin<D&>);
CPP_assert(!can_begin<D>);
CPP_assert(ranges::same_as<int*, decltype(ranges::begin(std::declval<D&>()))>);
CPP_assert(can_begin<const D&>);
CPP_assert(!can_begin<const D>);
CPP_assert(ranges::same_as<int const *, decltype(ranges::begin(std::declval<const D&>()))>);
{
using T = std::initializer_list<int>;
// Valid: begin accepts lvalue initializer_list
CPP_assert(ranges::same_as<int const *, decltype(ranges::begin(std::declval<T&>()))>);
CPP_assert(ranges::same_as<int const *, decltype(ranges::begin(std::declval<const T&>()))>);
CPP_assert(!can_begin<T>);
CPP_assert(!can_begin<T const>);
}
CPP_assert(can_begin<ranges::subrange<int*, int*>&>);
CPP_assert(can_begin<const ranges::subrange<int*, int*>&>);
CPP_assert(can_begin<ranges::subrange<int*, int*>>);
CPP_assert(can_begin<const ranges::subrange<int*, int*>>);
CPP_assert(can_cbegin<ranges::subrange<int*, int*>&>);
CPP_assert(can_cbegin<const ranges::subrange<int*, int*>&>);
CPP_assert(can_cbegin<ranges::subrange<int*, int*>>);
CPP_assert(can_cbegin<const ranges::subrange<int*, int*>>);
CPP_assert(can_begin<ranges::ref_view<int[5]>&>);
CPP_assert(can_begin<const ranges::ref_view<int[5]>&>);
CPP_assert(can_begin<ranges::ref_view<int[5]>>);
CPP_assert(can_begin<const ranges::ref_view<int[5]>>);
CPP_assert(can_cbegin<ranges::ref_view<int[5]>&>);
CPP_assert(can_cbegin<const ranges::ref_view<int[5]>&>);
CPP_assert(can_cbegin<ranges::ref_view<int[5]>>);
CPP_assert(can_cbegin<const ranges::ref_view<int[5]>>);
// TODO
// CPP_assert(can_begin<ranges::iota_view<int, int>&>);
// CPP_assert(can_begin<const ranges::iota_view<int, int>&>);
// CPP_assert(can_begin<ranges::iota_view<int, int>>);
// CPP_assert(can_begin<const ranges::iota_view<int, int>>);
// CPP_assert(can_cbegin<ranges::iota_view<int, int>&>);
// CPP_assert(can_cbegin<const ranges::iota_view<int, int>&>);
// CPP_assert(can_cbegin<ranges::iota_view<int, int>>);
// CPP_assert(can_cbegin<const ranges::iota_view<int, int>>);
}
} // namespace begin_testing
namespace X
{
template<class T, std::size_t N>
struct array
{
T elements_[N];
constexpr bool empty() const noexcept { return N == 0; }
constexpr T* data() noexcept { return elements_; }
constexpr T const *data() const noexcept { return elements_; }
};
template<class T, std::size_t N>
constexpr T* begin(array<T, N> &a) noexcept { return a.elements_; }
template<class T, std::size_t N>
constexpr T* end(array<T, N> &a) noexcept { return a.elements_ + N; }
template<class T, std::size_t N>
constexpr T const *begin(array<T, N> const &a) noexcept { return a.elements_; }
template<class T, std::size_t N>
constexpr T const *end(array<T, N> const &a) noexcept { return a.elements_ + N; }
} // namespace X
using I = int*;
using CI = int const *;
CPP_assert(ranges::input_or_output_iterator<I>);
CPP_assert(ranges::input_or_output_iterator<CI>);
#if defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201603L
void test_string_view_p0970()
{
// basic_string_views are non-dangling
using I2 = ranges::iterator_t<std::string_view>;
CPP_assert(ranges::same_as<I2, decltype(ranges::begin(std::declval<std::string_view>()))>);
CPP_assert(ranges::same_as<I2, decltype(ranges::end(std::declval<std::string_view>()))>);
CPP_assert(ranges::same_as<I2, decltype(ranges::begin(std::declval<const std::string_view>()))>);
CPP_assert(ranges::same_as<I2, decltype(ranges::end(std::declval<const std::string_view>()))>);
{
const char hw[] = "Hello, World!";
auto result = ranges::find(std::string_view{hw}, 'W');
CPP_assert(ranges::same_as<I2, decltype(result)>);
CHECK(result == std::string_view{hw}.begin() + 7);
}
}
#endif
int main()
{
using namespace ranges;
static constexpr X::array<int, 4> some_ints = {{0,1,2,3}};
CPP_assert(begin_testing::can_begin<X::array<int, 4> &>);
CPP_assert(begin_testing::can_begin<X::array<int, 4> const &>);
CPP_assert(!begin_testing::can_begin<X::array<int, 4>>);
CPP_assert(!begin_testing::can_begin<X::array<int, 4> const>);
CPP_assert(begin_testing::can_cbegin<X::array<int, 4> &>);
CPP_assert(begin_testing::can_cbegin<X::array<int, 4> const &>);
CPP_assert(!begin_testing::can_cbegin<X::array<int, 4>>);
CPP_assert(!begin_testing::can_cbegin<X::array<int, 4> const>);
constexpr auto first = begin(some_ints);
constexpr auto last = end(some_ints);
CPP_assert(ranges::same_as<const CI, decltype(first)>);
CPP_assert(ranges::same_as<const CI, decltype(last)>);
static_assert(first == cbegin(some_ints), "");
static_assert(last == cend(some_ints), "");
static_assert(noexcept(begin(some_ints)), "");
static_assert(noexcept(end(some_ints)), "");
static_assert(noexcept(cbegin(some_ints)), "");
static_assert(noexcept(cend(some_ints)), "");
static_assert(noexcept(empty(some_ints)), "");
static_assert(noexcept(data(some_ints)), "");
constexpr bool output = false;
static_assert(!empty(some_ints), "");
if(output)
std::cout << '{';
auto is_first = true;
auto count = 0;
for(auto&& i : some_ints)
{
CHECK(i == count++);
if(is_first)
is_first = false;
else
if(output) std::cout << ", ";
if(output) std::cout << i;
}
if(output)
std::cout << "}\n";
test_initializer_list();
test_array<int>(std::make_integer_sequence<int, 3>{});
test_array<int const>(std::make_integer_sequence<int, 3>{});
begin_testing::test();
#if defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201603L
test_string_view_p0970();
#endif
return ::test_result();
}
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