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170 lines (141 loc) · 4.67 KB
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#include <cppitertools/compress.hpp>
#include "helpers.hpp"
#include <iterator>
#include <string>
#include <utility>
#include <vector>
#include "catch.hpp"
using iter::compress;
using itertest::SolidInt;
using itertest::BasicIterable;
using Vec = const std::vector<int>;
TEST_CASE("compress: alternating", "[compress]") {
std::vector<int> ivec{1, 2, 3, 4, 5, 6};
std::vector<bool> bvec{true, false, true, false, true, false};
auto c = compress(ivec, bvec);
Vec v(std::begin(c), std::end(c));
Vec vc = {1, 3, 5};
REQUIRE(v == vc);
}
TEST_CASE("compress: const iteration ", "[compress][const]") {
std::vector<int> ivec{1, 2, 3, 4, 5, 6};
std::vector<bool> bvec{true, false, true, false, true, false};
const auto c = compress(ivec, bvec);
Vec v(std::begin(c), std::end(c));
Vec vc = {1, 3, 5};
REQUIRE(v == vc);
}
TEST_CASE("compress: const iterators can be compared to non-const iterators",
"[compress][const]") {
auto c = compress(std::vector<int>{}, std::vector<bool>{});
const auto& cc = c;
(void)(std::begin(c) == std::end(cc));
}
TEST_CASE("compress: consecutive falses", "[compress]") {
std::vector<int> ivec{1, 2, 3, 4, 5};
std::vector<bool> bvec{true, false, false, false, true};
auto c = compress(ivec, bvec);
Vec v(std::begin(c), std::end(c));
Vec vc = {1, 5};
REQUIRE(v == vc);
}
TEST_CASE("compress: consecutive trues", "[compress]") {
std::vector<int> ivec{1, 2, 3, 4, 5};
std::vector<bool> bvec{false, true, true, true, false};
auto c = compress(ivec, bvec);
Vec v(std::begin(c), std::end(c));
Vec vc = {2, 3, 4};
REQUIRE(v == vc);
}
TEST_CASE("compress: all true", "[compress]") {
std::vector<int> ivec{1, 2, 3, 4, 5};
std::vector<bool> bvec(ivec.size(), true);
auto c = compress(ivec, bvec);
Vec v(std::begin(c), std::end(c));
REQUIRE(v == ivec);
}
TEST_CASE("compress: all false", "[compress]") {
std::vector<int> ivec{1, 2, 3, 4, 5};
std::vector<bool> bvec(ivec.size(), false);
auto c = compress(ivec, bvec);
REQUIRE(std::begin(c) == std::end(c));
}
TEST_CASE("compress: operator->", "[compress") {
std::vector<std::string> svec = {"a", "abc", "abcde"};
std::vector<bool> bvec = {false, false, true};
auto c = compress(svec, bvec);
auto it = std::begin(c);
REQUIRE(it->size() == 5);
}
TEST_CASE("compress: binds to lvalues, moves rvalues", "[compress]") {
BasicIterable<char> bi{'x', 'y', 'z'};
std::vector<bool> bl{true, true, true};
SECTION("binds to lvalues") {
compress(bi, bl);
REQUIRE_FALSE(bi.was_moved_from());
}
SECTION("moves rvalues") {
compress(std::move(bi), bl);
REQUIRE(bi.was_moved_from());
}
}
struct BoolLike {
public:
bool state;
explicit operator bool() const {
return this->state;
}
};
TEST_CASE("compress: workds with truthy and falsey values", "[compress]") {
std::vector<BoolLike> bvec{{true}, {false}, {true}, {false}};
Vec ivec{1, 2, 3, 4};
auto c = compress(ivec, bvec);
Vec v(std::begin(c), std::end(c));
Vec vc = {1, 3};
REQUIRE(v == vc);
}
TEST_CASE("compress: terminates on shorter selectors", "[compress]") {
std::vector<int> ivec{1, 2, 3, 4, 5};
std::vector<bool> bvec{true};
auto c = compress(ivec, bvec);
REQUIRE(std::distance(std::begin(c), std::end(c)) == 1);
}
TEST_CASE("compress: terminates on shorter data", "[compress]") {
std::vector<int> ivec{1};
std::vector<bool> bvec{true, true, true, true, true};
auto c = compress(ivec, bvec);
REQUIRE(std::distance(std::begin(c), std::end(c)) == 1);
}
TEST_CASE("compress: nothing on empty selectors", "[compress]") {
std::vector<int> ivec{1, 2, 3};
std::vector<bool> bvec{};
auto c = compress(ivec, bvec);
REQUIRE(std::begin(c) == std::end(c));
}
TEST_CASE("compress: nothing on empty data", "[compress]") {
std::vector<int> ivec{};
std::vector<bool> bvec{true, true, true};
auto c = compress(ivec, bvec);
REQUIRE(std::begin(c) == std::end(c));
}
TEST_CASE("compress: iterator meets requirements", "[compress]") {
std::string s{};
std::vector<bool> bv;
auto c = compress(s, bv);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
}
TEST_CASE("compress: Works with different begin and end types", "[compress]") {
CharRange cr{'d'};
auto c = compress(cr, std::vector<bool>{true, false, true});
Vec v(c.begin(), c.end());
Vec vc{'a', 'c'};
REQUIRE(v == vc);
}
template <typename T, typename U>
using ImpT = decltype(compress(std::declval<T>(), std::declval<U>()));
TEST_CASE("compress: has correct ctor and assign ops", "[compress]") {
using T1 = ImpT<std::string&, std::vector<bool>&>;
using T2 = ImpT<std::string, std::vector<bool>>;
REQUIRE(itertest::IsMoveConstructibleOnly<T1>::value);
REQUIRE(itertest::IsMoveConstructibleOnly<T2>::value);
}