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144 lines (111 loc) · 3.77 KB
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// mixing different itertools, there is nothing called iter::mixed()
#include "itertools.hpp"
#include "catch.hpp"
#include <iostream>
#include <vector>
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 val) {
this->val = 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::imap;
using iter::dropwhile;
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::imap;
using iter::filter;
using iter::enumerate;
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);
}