forked from ryanhaining/cppitertools
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtest_zip_longest.cpp
More file actions
145 lines (120 loc) · 4.24 KB
/
Copy pathtest_zip_longest.cpp
File metadata and controls
145 lines (120 loc) · 4.24 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
#include <zip_longest.hpp>
#include "helpers.hpp"
#include <vector>
#include <tuple>
#include <string>
#include <iterator>
#include <utility>
#include <iterator>
#include <sstream>
#include <iostream>
#include "catch.hpp"
using iter::zip_longest;
// reopening boost is the only way I can find that gets this to print
namespace boost {
template <typename T>
std::ostream& operator<<(std::ostream& out, const optional<T>& opt) {
if (opt) {
out << "Just " << *opt;
} else {
out << "Nothing";
}
return out;
}
}
template <typename... Ts>
using const_opt_tuple = std::tuple<boost::optional<const Ts&>...>;
TEST_CASE(
"zip longest: correctly detects longest at any position", "[zip_longest]") {
const std::vector<int> ivec{2, 4, 6, 8, 10, 12};
const std::vector<std::string> svec{"abc", "def", "xyz"};
const std::string str{"hello"};
SECTION("longest first") {
using TP = const_opt_tuple<int, std::string, char>;
using ResVec = std::vector<TP>;
auto zl = zip_longest(ivec, svec, str);
ResVec results(std::begin(zl), std::end(zl));
ResVec rc = {TP{{ivec[0]}, {svec[0]}, {str[0]}},
TP{{ivec[1]}, {svec[1]}, {str[1]}}, TP{{ivec[2]}, {svec[2]}, {str[2]}},
TP{{ivec[3]}, {}, {str[3]}}, TP{{ivec[4]}, {}, {str[4]}},
TP{{ivec[5]}, {}, {}}};
REQUIRE(results == rc);
}
SECTION("longest in middle") {
using TP = const_opt_tuple<std::string, int, char>;
using ResVec = std::vector<TP>;
auto zl = zip_longest(svec, ivec, str);
ResVec results(std::begin(zl), std::end(zl));
ResVec rc = {TP{{svec[0]}, {ivec[0]}, {str[0]}},
TP{{svec[1]}, {ivec[1]}, {str[1]}}, TP{{svec[2]}, {ivec[2]}, {str[2]}},
TP{{}, {ivec[3]}, {str[3]}}, TP{{}, {ivec[4]}, {str[4]}},
TP{{}, {ivec[5]}, {}}};
REQUIRE(results == rc);
}
SECTION("longest at end") {
using TP = const_opt_tuple<std::string, char, int>;
using ResVec = std::vector<TP>;
auto zl = zip_longest(svec, str, ivec);
ResVec results(std::begin(zl), std::end(zl));
ResVec rc = {TP{{svec[0]}, {str[0]}, {ivec[0]}},
TP{{svec[1]}, {str[1]}, {ivec[1]}}, TP{{svec[2]}, {str[2]}, {ivec[2]}},
TP{{}, {str[3]}, {ivec[3]}}, TP{{}, {str[4]}, {ivec[4]}},
TP{{}, {}, {ivec[5]}}};
REQUIRE(results == rc);
}
}
TEST_CASE(
"zip longest: when all are empty, terminates right away", "[zip_longest]") {
const std::vector<int> ivec{};
const std::vector<std::string> svec{};
const std::string str{};
auto zl = zip_longest(ivec, svec, str);
REQUIRE(std::begin(zl) == std::end(zl));
}
TEST_CASE("zip longest: can modify zipped sequences", "[zip_longest]") {
std::vector<int> ns1 = {1, 2, 3};
std::vector<int> ns2 = {10, 11, 12};
for (auto&& t : zip_longest(ns1, ns2)) {
*std::get<0>(t) = -1;
*std::get<1>(t) = -1;
}
std::vector<int> vc = {-1, -1, -1};
REQUIRE(ns1 == vc);
REQUIRE(ns2 == vc);
}
TEST_CASE("zip longest: empty zip_longest() is empty", "[zip_longest]") {
auto zl = zip_longest();
REQUIRE(std::begin(zl) == std::end(zl));
REQUIRE_FALSE(std::begin(zl) != std::end(zl));
}
TEST_CASE("zip_longest: binds to lvalues, moves rvalues", "[zip_longest]") {
itertest::BasicIterable<char> b1{'x', 'y', 'z'};
itertest::BasicIterable<char> b2{'a', 'b'};
SECTION("bind to first, moves second") {
zip_longest(b1, std::move(b2));
}
SECTION("move first, bind to second") {
zip_longest(std::move(b2), b1);
}
REQUIRE_FALSE(b1.was_moved_from());
REQUIRE(b2.was_moved_from());
}
TEST_CASE("zip_longest: doesn't move or copy elements", "[zip_longest]") {
constexpr itertest::SolidInt arr[] = {{6}, {7}, {8}};
for (auto&& t : zip_longest(arr, arr)) {
(void)std::get<0>(t);
}
}
TEST_CASE("zip_longest: iterator meets requirements", "[zip_longest]") {
std::string s{};
auto c = zip_longest(s);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
auto c2 = zip_longest(s, s);
REQUIRE(itertest::IsIterator<decltype(std::begin(c2))>::value);
}
template <typename... Ts>
using ImpT = decltype(zip_longest(std::declval<Ts>()...));
TEST_CASE("zip_longest: has correct ctor and assign ops", "[zip_longest]") {
using T = ImpT<std::string&, std::vector<double>, std::vector<std::string>>;
REQUIRE(itertest::IsMoveConstructibleOnly<T>::value);
}