eea806bcc9
If std::common_type<range::index_type>... finds a common index_type among all the zipped ranges, pass that common type through as zip<...>::index_type. Otherwise, set zip<...>::index_type to void. This allows enumerate(zip(...))) to report a better index_type.
92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
#include "d_range.h"
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#include "d_zip.h"
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#include <array>
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#include <vector>
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#define BOOST_TEST_DYN_LINK
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#define BOOST_TEST_MODULE Rebirth zip
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#include <boost/test/unit_test.hpp>
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/* Test that a zipped range is empty when the component range is empty.
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*/
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BOOST_AUTO_TEST_CASE(zip_empty)
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{
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bool empty = true;
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std::array<int, 0> a;
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for (auto &&v : zip(a))
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{
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(void)v;
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empty = false;
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}
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BOOST_TEST(empty);
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}
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/* Test that a zipped range is the length of the first sequence.
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*
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* Note that there is no test for when the first sequence is longer than
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* the later ones, since such a test would increment some iterators past
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* their end.
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*/
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BOOST_AUTO_TEST_CASE(zip_length)
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{
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unsigned count = 0;
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std::array<int, 2> a;
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short b[4];
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for (auto &&v : zip(a, b))
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{
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(void)v;
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++ count;
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}
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BOOST_TEST(count == a.size());
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}
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/* Test that a zipped value references the underlying storage.
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*/
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BOOST_AUTO_TEST_CASE(zip_passthrough_modifications)
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{
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std::array<int, 1> a{{1}};
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short b[1]{2};
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for (auto &&v : zip(a, b))
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{
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++ std::get<0>(v);
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++ std::get<1>(v);
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}
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BOOST_TEST(a[0] == 2);
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BOOST_TEST(b[0] == 3);
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}
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/* Test that a zipped range can zip an xrange, and produce the correct
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* underlying value.
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*/
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BOOST_AUTO_TEST_CASE(zip_xrange)
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{
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for (auto &&v : zip(xrange(1u)))
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{
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BOOST_TEST(std::get<0>(v) == 0);
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}
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}
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/* Type system tests can be done at compile-time. Applying them as
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* static_assert can produce a better error message than letting it fail
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* at runtime.
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*/
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template <typename Expected, typename zip_type, typename index_type = typename zip_type::index_type>
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struct assert_index_type : std::true_type
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{
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static_assert(std::is_same<Expected, index_type>::value);
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};
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static_assert(assert_index_type<void, decltype(zip(std::declval<std::array<int, 1>>(), std::declval<std::array<float, 1>>()))>::value);
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template <typename T>
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struct custom_index_type : std::array<int, 1>
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{
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using index_type = T;
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void operator[](typename std::remove_reference<T>::type);
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};
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enum class e1 : unsigned char;
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enum class e2 : unsigned char;
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static_assert(assert_index_type<e1, decltype(zip(std::declval<custom_index_type<e1>&>(), std::declval<custom_index_type<e1>&>()))>::value);
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static_assert(assert_index_type<void, decltype(zip(std::declval<custom_index_type<e1>&>(), std::declval<custom_index_type<e2>&>()))>::value);
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