forked from ryanhaining/cppitertools
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtest_takewhile.cpp
More file actions
179 lines (153 loc) · 4.64 KB
/
Copy pathtest_takewhile.cpp
File metadata and controls
179 lines (153 loc) · 4.64 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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
#include <takewhile.hpp>
#include <array>
#include <string>
#include <utility>
#include <vector>
#include "catch.hpp"
#include "helpers.hpp"
using iter::takewhile;
using Vec = const std::vector<int>;
namespace {
bool under_ten(int i) {
return i < 10;
}
struct UnderTen {
bool operator()(int i) {
return i < 10;
}
};
}
TEST_CASE("takewhile: works with lambda, callable, and function pointer",
"[takewhile]") {
Vec ns = {1, 3, 5, 20, 2, 4, 6, 8};
SECTION("function pointer") {
auto tw = takewhile(under_ten, ns);
Vec v(std::begin(tw), std::end(tw));
Vec vc = {1, 3, 5};
REQUIRE(v == vc);
}
SECTION("callable object") {
std::vector<int> v;
SECTION("Normal call") {
auto tw = takewhile(UnderTen{}, ns);
v.assign(std::begin(tw), std::end(tw));
}
SECTION("Pipe") {
auto tw = ns | takewhile(UnderTen{});
v.assign(std::begin(tw), std::end(tw));
}
Vec vc = {1, 3, 5};
REQUIRE(v == vc);
}
SECTION("lambda") {
auto tw = takewhile([](int i) { return i < 10; }, ns);
Vec v(std::begin(tw), std::end(tw));
Vec vc = {1, 3, 5};
REQUIRE(v == vc);
}
}
TEST_CASE("takewhile: handles pointer to member", "[takewhile]") {
using itertest::Point;
const std::vector<Point> ps = {
{5, 0}, {3, 5}, {2, 1}, {0, 1}, {2, 2}, {6, 0}};
std::vector<Point> v;
SECTION("with pointer to data member") {
auto tw = takewhile(&Point::x, ps);
v.assign(std::begin(tw), std::end(tw));
}
SECTION("with pointer to member function") {
auto tw = takewhile(&Point::get_x, ps);
v.assign(std::begin(tw), std::end(tw));
}
const std::vector<Point> vc = {{5, 0}, {3, 5}, {2, 1}};
REQUIRE(v == vc);
}
TEST_CASE("takewhile: supports const iteration", "[takewhile][const]") {
Vec ns = {1, 3, 5, 20, 2, 4, 6, 8};
const auto tw = takewhile(UnderTen{}, ns);
Vec v(std::begin(tw), std::end(tw));
Vec vc = {1, 3, 5};
REQUIRE(v == vc);
}
TEST_CASE("takewhile: const iterator and non-const iterator are comparable",
"[takewhile][const]") {
auto tw = takewhile(UnderTen{}, Vec{});
const auto& ctw = tw;
(void)(std::begin(tw) == std::end(ctw));
}
TEST_CASE(
"takewhile: Works with different begin and end types", "[takewhile]") {
CharRange cr{'f'};
auto t = takewhile([](char c) { return c < 'd'; }, cr);
Vec v(t.begin(), t.end());
Vec vc{'a', 'b', 'c'};
REQUIRE(v == vc);
}
TEST_CASE("takewhile: identity", "[takewhile]") {
Vec ns{1, 2, 3, 0, 4, 5, 0};
std::vector<int> v;
SECTION("Normal call") {
auto tw = takewhile(ns);
v.assign(std::begin(tw), std::end(tw));
}
SECTION("Pipe") {
auto tw = ns | takewhile;
v.assign(std::begin(tw), std::end(tw));
}
Vec vc = {1, 2, 3};
REQUIRE(v == vc);
}
TEST_CASE("takewhile: everything passes predicate", "[takewhile]") {
Vec ns{1, 2, 3};
auto tw = takewhile(under_ten, ns);
Vec v(std::begin(tw), std::end(tw));
Vec vc = {1, 2, 3};
}
TEST_CASE("takewhile: empty iterable is empty", "[takewhile]") {
Vec ns{};
auto tw = takewhile(under_ten, ns);
REQUIRE(std::begin(tw) == std::end(tw));
}
TEST_CASE(
"takewhile: when first element fails predicate, it's empty"
"[takewhile]") {
SECTION("First element is only element") {
Vec ns = {20};
auto tw = takewhile(under_ten, ns);
REQUIRE(std::begin(tw) == std::end(tw));
}
SECTION("First element followed by elements that pass") {
Vec ns = {20, 1, 1};
auto tw = takewhile(under_ten, ns);
REQUIRE(std::begin(tw) == std::end(tw));
}
}
TEST_CASE("takewhile: moves rvalues, binds to lvalues", "[takewhile]") {
itertest::BasicIterable<int> bi{1, 2};
takewhile(under_ten, bi);
REQUIRE_FALSE(bi.was_moved_from());
takewhile(under_ten, std::move(bi));
REQUIRE(bi.was_moved_from());
}
TEST_CASE(
"takewhile: with iterable doesn't move or copy elements", "[takewhile]") {
constexpr std::array<itertest::SolidInt, 3> arr{{{8}, {9}, {10}}};
auto func = [](const itertest::SolidInt& si) { return si.getint() < 10; };
for (auto&& i : takewhile(func, arr)) {
(void)i;
}
}
TEST_CASE("takewhile: iterator meets requirements", "[takewhile]") {
std::string s{};
auto c = takewhile([] { return true; }, s);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
}
template <typename T, typename U>
using ImpT = decltype(takewhile(std::declval<T>(), std::declval<U>()));
TEST_CASE("takewhile: has correct ctor and assign ops", "[takewhile]") {
using T1 = ImpT<bool (*)(char c), std::string&>;
auto lam = [](char) { return false; };
using T2 = ImpT<decltype(lam), std::string>;
REQUIRE(itertest::IsMoveConstructibleOnly<T1>::value);
REQUIRE(itertest::IsMoveConstructibleOnly<T2>::value);
}