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Copy pathtest_powerset.cpp
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159 lines (140 loc) · 4.17 KB
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#include <cppitertools/powerset.hpp>
#define CHAR_RANGE_DEFAULT_CONSTRUCTIBLE
#include "helpers.hpp"
#undef CHAR_RANGE_DEFAULT_CONSTRUCTIBLE
#include <iterator>
#include <set>
#include <string>
#include <vector>
#include "catch.hpp"
using iter::powerset;
using IntPermSet = std::multiset<std::multiset<int>>;
TEST_CASE("powerset: basic test, [1, 2, 3]", "[powerset]") {
const std::vector<int> ns = {1, 2, 3};
IntPermSet v;
SECTION("Normal call") {
for (auto&& st : powerset(ns)) {
v.emplace(std::begin(st), std::end(st));
}
}
SECTION("Pipe") {
for (auto&& st : ns | powerset) {
v.emplace(std::begin(st), std::end(st));
}
}
const IntPermSet vc = {
std::multiset<int>{}, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}};
REQUIRE(v == vc);
}
TEST_CASE("powerset: const iteration", "[powerset][const]") {
const std::vector<int> ns = {1, 2, 3};
IntPermSet v;
const auto ps = powerset(ns);
for (auto&& st : ps) {
v.emplace(std::begin(st), std::end(st));
}
const IntPermSet vc = {
std::multiset<int>{}, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}};
REQUIRE(v == vc);
}
// TODO this doesn't work because two different Powersetter::Iterator types use
// two different Combinator types
#if 0
TEST_CASE("powerset: const iterators can be compared to non-const iterators", "[powerset][const]") {
auto ps = powerset(std::vector<int>{});
const auto& cps = ps;
(void)(std::begin(ps) == std::end(cps));
}
#endif
TEST_CASE("powerset: Works with different begin and end types", "[powerset]") {
CharRange cr{'d'};
using CharPermSet = std::multiset<std::vector<char>>;
CharPermSet sc;
for (auto&& v : powerset(cr)) {
sc.emplace(std::begin(v), std::end(v));
}
const CharPermSet ans = {{}, {'a'}, {'b'}, {'c'}, {'a', 'b'}, {'a', 'c'},
{'b', 'c'}, {'a', 'b', 'c'}};
REQUIRE(ans == sc);
}
TEST_CASE("powerset: empty sequence gives only empty set", "[powerset]") {
const std::vector<int> ns = {};
auto ps = powerset(ns);
auto it = std::begin(ps);
REQUIRE(std::begin(*it) == std::end(*it)); // it's empty
++it;
REQUIRE(it == std::end(ps));
}
TEST_CASE("powerset: iterators can be compared", "[powerset]") {
std::vector<int> ns = {1, 2};
auto p = powerset(ns);
{
auto it = std::begin(p);
REQUIRE(it == std::begin(p));
REQUIRE_FALSE(it != std::begin(p));
REQUIRE(it != std::end(p));
REQUIRE_FALSE(it == std::end(p));
++it;
REQUIRE_FALSE(it == std::begin(p));
REQUIRE(it != std::begin(p));
REQUIRE_FALSE(it == std::end(p));
REQUIRE(it != std::end(p));
++it;
++it;
++it;
REQUIRE(it == std::end(p));
}
ns.push_back(3);
{
auto it = std::begin(p);
auto it2 = std::begin(p);
std::advance(it, 4);
std::advance(it2, 4);
REQUIRE(it == it2);
++it2;
REQUIRE(it != it2);
}
}
TEST_CASE("powerset: iterator copy ctor is correct", "[powerset]") {
// { {}, {1}, {2}, {1, 2} }
std::vector<int> ns = {1, 2};
auto p = powerset(ns);
auto it = std::begin(p);
auto it2(it);
REQUIRE(it == it2);
++it2;
REQUIRE(it != it2);
REQUIRE(std::begin(*it) == std::end(*it));
}
TEST_CASE("powerset: binds to lvalues, moves rvalues", "[powerset]") {
itertest::BasicIterable<int> bi{1, 2};
SECTION("binds to lvalues") {
powerset(bi);
REQUIRE_FALSE(bi.was_moved_from());
}
SECTION("moves rvalues") {
powerset(std::move(bi));
REQUIRE(bi.was_moved_from());
}
}
TEST_CASE("powerset: doesn't move or copy elements of iterable", "[powerset]") {
constexpr itertest::SolidInt arr[] = {{1}, {0}, {2}};
for (auto&& st : powerset(arr)) {
for (auto&& i : st) {
(void)i;
}
}
}
TEST_CASE("powerset: iterator meets requirements", "[powerset]") {
std::string s{"abc"};
auto c = powerset(s);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
auto&& row = *std::begin(c);
REQUIRE(itertest::IsIterator<decltype(std::begin(row))>::value);
}
template <typename T>
using ImpT = decltype(powerset(std::declval<T>()));
TEST_CASE("powerset: has correct ctor and assign ops", "[powerset]") {
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT<std::string&>>::value);
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT<std::string>>::value);
}