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277 lines (224 loc) · 7.47 KB
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// mixing different itertools, there is nothing called iter::mixed()
#include <iostream>
#include <vector>
#include "catch.hpp"
#include "cppitertools/itertools.hpp"
class MyUnMovable {
int val;
public:
constexpr MyUnMovable(int val) : val{val} {}
MyUnMovable(const MyUnMovable&) = delete;
MyUnMovable& operator=(const MyUnMovable&) = delete;
MyUnMovable(MyUnMovable&& other) : val{other.val} {}
constexpr int get_val() const {
return val;
}
void set_val(int new_val) {
this->val = new_val;
}
bool operator==(const MyUnMovable& other) const {
return this->val == other.val;
}
bool operator!=(const MyUnMovable& other) const {
return !(*this == other);
}
};
namespace {
auto inc_ten = [](MyUnMovable& el) -> MyUnMovable& {
int va = el.get_val();
el.set_val(va + 10);
return el;
};
auto dec_ten = [](MyUnMovable& el) -> MyUnMovable& {
int va = el.get_val();
el.set_val(va - 10);
return el;
};
}
TEST_CASE("filtering doesn't dereference multiple times", "[imap][filter]") {
using iter::filter;
using iter::imap;
// source data
std::array<MyUnMovable, 3> arr = {{{41}, {42}, {43}}};
auto transformed1 = imap(inc_ten, arr);
auto filtered = filter(
[](const MyUnMovable& el) { return 52 != el.get_val(); }, transformed1);
auto transformed2 = imap(dec_ten, filtered);
std::vector<int> v;
for (auto&& el : transformed2) {
// I would use imap again instead of the loop if this wasn't an imap
// test
v.push_back(el.get_val());
}
std::vector<int> vc = {41, 43};
REQUIRE(v == vc);
constexpr std::array<MyUnMovable, 3> arrc = {{{41}, {52}, {43}}};
REQUIRE(arr == arrc);
}
TEST_CASE("dropwhile doesn't dereference multiple times", "[imap][dropwhile]") {
using iter::dropwhile;
using iter::imap;
std::array<MyUnMovable, 3> arr = {{{41}, {42}, {43}}};
auto transformed1 = imap(inc_ten, arr);
auto filtered = dropwhile(
[](const MyUnMovable& el) { return 52 != el.get_val(); }, transformed1);
auto transformed2 = imap(dec_ten, filtered);
std::vector<int> v;
for (auto&& el : transformed2) {
v.push_back(el.get_val());
}
std::vector<int> vc = {42, 43};
std::vector<int> vsc = {51, 42, 43};
auto get_vals = imap([](const MyUnMovable& mv) { return mv.get_val(); }, arr);
std::vector<int> vs(std::begin(get_vals), std::end(get_vals));
REQUIRE(vs == vsc);
}
TEST_CASE("takewhile doesn't dereference multiple times", "[imap][takewhile]") {
using iter::imap;
using iter::takewhile;
std::array<MyUnMovable, 3> arr = {{{41}, {42}, {43}}};
auto transformed1 = imap(inc_ten, arr);
auto filtered = takewhile(
[](const MyUnMovable& el) { return 53 != el.get_val(); }, transformed1);
auto transformed2 = imap(dec_ten, filtered);
std::vector<int> v;
for (auto&& el : transformed2) {
v.push_back(el.get_val());
}
std::vector<int> vc = {41, 42};
std::vector<int> vsc = {41, 42, 53};
auto get_vals = imap([](const MyUnMovable& mv) { return mv.get_val(); }, arr);
std::vector<int> vs(std::begin(get_vals), std::end(get_vals));
REQUIRE(vs == vsc);
}
TEST_CASE("sorted(chain.from_iterable)", "[sorted][chain.from_iterable]") {
std::vector<std::vector<int>> v = {{2, 4, 6}};
auto s = iter::sorted(iter::chain.from_iterable(v));
}
TEST_CASE("filter into enumerate with pipe", "[filter][enumerate]") {
using iter::enumerate;
using iter::filter;
using iter::imap;
std::array<MyUnMovable, 4> arr = {{{41}, {42}, {43}, {44}}};
auto seq =
arr | filter([](const MyUnMovable& mv) { return mv.get_val() % 2 == 0; })
| enumerate | imap([](const auto& imv) {
return std::make_pair(imv.first, imv.second.get_val());
});
using Vec = std::vector<std::pair<std::size_t, int>>;
const Vec v(std::begin(seq), std::end(seq));
const Vec vc = {{0, 42}, {1, 44}};
REQUIRE(v == vc);
}
TEST_CASE("enumerate(filter(chunked()))", "[filter][enumerate][chunked]") {
using iter::chunked;
using iter::enumerate;
using iter::filter;
std::vector<int16_t> v(500);
auto chunks = chunked(v, 100);
auto filtered = filter([](auto&) { return true; }, chunks);
for (auto&& [i, chunk] : enumerate(filtered)) {
(void)i;
REQUIRE(chunk.size() == 100);
}
}
TEST_CASE("zip(filter(chunked()))", "[filter][chunked][zip]") {
using iter::chunked;
using iter::filter;
using iter::zip;
std::vector<int16_t> v(500);
auto chunks = chunked(v, 100);
auto filtered = filter([](auto&) { return true; }, chunks);
for (auto&& [chunk] : zip(filtered)) {
REQUIRE(chunk.size() == 100);
}
}
TEST_CASE("zip(filter(sliding_window()))", "[filter][sliding_window][zip]") {
using iter::filter;
using iter::sliding_window;
using iter::zip;
std::vector<int16_t> v(15);
auto windows = sliding_window(v, 10);
auto filtered = filter([](auto&) { return true; }, windows);
for (auto&& [window] : zip(filtered)) {
REQUIRE(window.size() == 10);
}
}
TEST_CASE("imap(filter(groupby()))", "[filter][groupby][imap])") {
using iter::filter;
using iter::groupby;
using iter::imap;
std::vector<int> v{true, true, true, false, false, true, true};
auto a = groupby(v, [](bool b) { return b; });
auto b = filter([](auto& g) { return g.first; }, a);
auto c = imap(
[](auto& g) { return std::distance(g.second.begin(), g.second.end()); },
b);
for (auto x : c) {
(void)x;
}
}
TEST_CASE("imap(dropwhile(groupby()))", "[dropwhile][groupby][imap])") {
using iter::dropwhile;
using iter::groupby;
using iter::imap;
std::vector<int> v{false, false, true, true, false, true, true};
auto a = groupby(v, [](bool b) { return b; });
auto b = dropwhile([](auto& g) { return g.first; }, a);
auto c = imap(
[](auto& g) { return std::distance(g.second.begin(), g.second.end()); },
b);
for (auto x : c) {
(void)x;
}
}
TEST_CASE("imap(takewhile(groupby()))", "[takewhile][groupby][imap])") {
using iter::groupby;
using iter::imap;
using iter::takewhile;
std::vector<int> v{true, true, true, false, false};
auto a = groupby(v, [](bool b) { return b; });
auto b = takewhile([](auto& g) { return g.first; }, a);
auto c = imap(
[](auto& g) { return std::distance(g.second.begin(), g.second.end()); },
b);
for (auto x : c) {
(void)x;
}
}
TEST_CASE("chain.from_iterable: accept imap result that yields rvalues",
"[chain.from_iterable][imap]") {
using iter::chain;
using iter::imap;
const std::vector<std::vector<char>> ns = {{'a'}, {'q'}, {'x', 'z'}};
auto ch = iter::chain.from_iterable(iter::imap([](auto v) { return v; }, ns));
const std::vector<char> v(std::begin(ch), std::end(ch));
const std::vector<char> vc = {'a', 'q', 'x', 'z'};
REQUIRE(v == vc);
}
TEST_CASE(
"filter(enumerate()), DerefHolder works correctly (see github issue #62",
"[filter][enumerate]") {
using iter::enumerate;
using iter::filter;
std::vector<int> ns = {50, 55, 60, 65};
auto f =
iter::filter([](auto& i) { return std::get<0>(i) > 1; }, enumerate(ns));
const std::vector<std::pair<int, int>> v(std::begin(f), std::end(f));
const std::vector<std::pair<int, int>> vc = {{2, 60}, {3, 65}};
REQUIRE(v == vc);
}
TEST_CASE("reversed(repeat(v, n))", "[repeat][reversed]") {
using iter::repeat;
using iter::reversed;
auto rr = reversed(repeat('x', 5));
std::string s(rr.begin(), rr.end());
REQUIRE(s == "xxxxx");
}
TEST_CASE("reversed(repeat(v))", "[repeat][reversed]") {
using iter::repeat;
using iter::reversed;
auto rr = reversed(repeat('x'));
auto it = rr.begin();
REQUIRE(*it == 'x');
}