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Copy pathtest_slice.cpp
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170 lines (140 loc) · 4.29 KB
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#include <cppitertools/slice.hpp>
#include <string>
#include <utility>
#include <vector>
#include "catch.hpp"
#include "helpers.hpp"
using iter::slice;
using Vec = const std::vector<int>;
TEST_CASE("slice: take from beginning", "[slice]") {
Vec ns = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
std::vector<int> v;
SECTION("Normal call") {
auto sl = slice(ns, 5);
v.assign(std::begin(sl), std::end(sl));
}
SECTION("Pipe") {
auto sl = ns | slice(5);
v.assign(std::begin(sl), std::end(sl));
}
Vec vc = {10, 11, 12, 13, 14};
REQUIRE(v == vc);
}
TEST_CASE("slice: const iteration", "[slice][const]") {
Vec ns = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
const auto sl = slice(ns, 5);
Vec v(std::begin(sl), std::end(sl));
Vec vc = {10, 11, 12, 13, 14};
REQUIRE(v == vc);
}
TEST_CASE("slice: const iterator can be compared to non-const iterator",
"[slice][const]") {
auto sl = slice(Vec{}, 1);
const auto& csl = sl;
(void)(std::begin(sl) == std::end(csl));
}
TEST_CASE("slice: start and stop", "[slice]") {
Vec ns = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
std::vector<int> v;
SECTION("Normal call") {
auto sl = slice(ns, 2, 6);
v.assign(std::begin(sl), std::end(sl));
}
SECTION("Pipe") {
auto sl = ns | slice(2, 6);
v.assign(std::begin(sl), std::end(sl));
}
Vec vc = {12, 13, 14, 15};
REQUIRE(v == vc);
}
TEST_CASE("slice: Works with different begin and end types", "[slice]") {
CharRange cr{'z'};
auto sl = slice(cr, 2, 5);
std::vector<char> v(std::begin(sl), std::end(sl));
const std::vector<char> vc = {'c', 'd', 'e'};
REQUIRE(v == vc);
}
TEST_CASE("slice: start, stop, step", "[slice]") {
Vec ns = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
std::vector<int> v;
SECTION("Normal call") {
auto sl = slice(ns, 2, 8, 2);
v.assign(std::begin(sl), std::end(sl));
}
SECTION("Pipe") {
auto sl = ns | slice(2, 8, 2);
v.assign(std::begin(sl), std::end(sl));
}
Vec vc = {12, 14, 16};
REQUIRE(v == vc);
}
TEST_CASE("slice: empty iterable", "[slice]") {
Vec ns{};
auto sl = slice(ns, 3);
REQUIRE(std::begin(sl) == std::end(sl));
}
TEST_CASE("slice: stop is beyond end of iterable", "[slice]") {
Vec ns = {1, 2, 3};
auto sl = slice(ns, 10);
Vec v(std::begin(sl), std::end(sl));
REQUIRE(v == ns);
}
TEST_CASE("slice: start is beyond end of iterable", "[slice]") {
Vec ns = {1, 2, 3};
auto sl = slice(ns, 5, 10);
REQUIRE(std::begin(sl) == std::end(sl));
}
TEST_CASE("slice: (stop - start) % step != 0", "[slice]") {
Vec ns = {1, 2, 3, 4};
auto sl = slice(ns, 0, 2, 3);
Vec v(std::begin(sl), std::end(sl));
Vec vc = {1};
REQUIRE(v == vc);
}
TEST_CASE("slice: invalid ranges give 0 size slices", "[slice]") {
Vec ns = {1, 2, 3};
SECTION("negative step") {
auto sl = slice(ns, 1, 10, -1);
REQUIRE(std::begin(sl) == std::end(sl));
}
SECTION("stop < start") {
auto sl = slice(ns, 2, 0, 3);
REQUIRE(std::begin(sl) == std::end(sl));
}
}
TEST_CASE("slice: moves rvalues and binds to lvalues", "[slice]") {
itertest::BasicIterable<int> bi{1, 2, 3, 4};
slice(bi, 1, 3);
REQUIRE_FALSE(bi.was_moved_from());
auto sl = slice(std::move(bi), 1, 3);
REQUIRE(bi.was_moved_from());
Vec v(std::begin(sl), std::end(sl));
Vec vc = {2, 3};
REQUIRE(v == vc);
}
TEST_CASE("slice: with iterable doesn't move or copy elems", "[slice]") {
constexpr itertest::SolidInt arr[] = {{6}, {7}, {8}};
for (auto&& i : slice(arr, 2)) {
(void)i;
}
}
TEST_CASE("slice: iterator meets requirements", "[slice]") {
SECTION("with iterable yielding references") {
std::string s{"abcdef"};
auto c = slice(s, 1, 3);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
REQUIRE(itertest::ReferenceMatchesDeref<decltype(std::begin(c))>::value);
}
SECTION("with iterable yielding values") {
itertest::InputIterable it{};
auto c = slice(it, 1, 3);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
REQUIRE(itertest::ReferenceMatchesDeref<decltype(std::begin(c))>::value);
}
}
template <typename T>
using ImpT = decltype(slice(std::declval<T>(), 1));
TEST_CASE("slice: has correct ctor and assign ops", "[slice]") {
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT<std::string&>>::value);
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT<std::string>>::value);
}