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Copy pathtest_dropwhile.cpp
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199 lines (171 loc) · 5.38 KB
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#include <dropwhile.hpp>
#include "helpers.hpp"
#include <iterator>
#include <string>
#include <vector>
#include "catch.hpp"
using iter::dropwhile;
using Vec = const std::vector<int>;
namespace {
class LessThanValue {
private:
int compare_val;
public:
LessThanValue(int v) : compare_val(v) {}
bool operator()(int i) {
return i < this->compare_val;
}
};
}
TEST_CASE("dropwhile: skips initial elements", "[dropwhile]") {
Vec ns{1, 2, 3, 4, 5, 6, 7, 8};
std::vector<int> v;
SECTION("Normal call") {
auto d = dropwhile([](int i) { return i < 5; }, ns);
v.assign(std::begin(d), std::end(d));
}
SECTION("Pipe") {
auto d = ns | dropwhile([](int i) { return i < 5; });
v.assign(std::begin(d), std::end(d));
}
Vec vc = {5, 6, 7, 8};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: handles pointer to member", "[dropwhile]") {
using itertest::Point;
const std::vector<Point> ps = {
{5, 0}, {3, 5}, {2, 1}, {0, 1}, {2, 2}, {6, 0}};
std::vector<Point> v;
SECTION("with pointer to data member") {
auto dw = dropwhile(&Point::x, ps);
v.assign(std::begin(dw), std::end(dw));
}
SECTION("with pointer to member function") {
auto dw = dropwhile(&Point::get_x, ps);
v.assign(std::begin(dw), std::end(dw));
}
const std::vector<Point> vc = {{0, 1}, {2, 2}, {6, 0}};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: drop zeros from front", "[dropwhile]") {
using itertest::Integer;
const std::vector<Integer> nums = {0, 0, 3, 4, 0, 5, 0};
auto dw = dropwhile(&Integer::is_zero, nums);
const std::vector<Integer> v(std::begin(dw), std::end(dw));
const std::vector<Integer> vc = {3, 4, 0, 5, 0};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: const iteration", "[dropwhile][const]") {
Vec ns{1, 2, 3, 4, 5, 6, 7, 8};
const auto d = dropwhile(LessThanValue{5}, ns);
Vec v(std::begin(d), std::end(d));
Vec vc = {5, 6, 7, 8};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: const iterators can be compared to non-const iterators",
"[dropwhile][const]") {
auto d = dropwhile(LessThanValue{5}, Vec{});
const auto& cd = d;
(void)(std::begin(d) == std::end(cd));
}
TEST_CASE(
"dropwhile: Works with different begin and end types", "[dropwhile]") {
CharRange cr{'f'};
auto d = dropwhile([](char c) { return c < 'c'; }, cr);
Vec v(d.begin(), d.end());
Vec vc{'c', 'd', 'e'};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: doesn't skip anything if it shouldn't", "[dropwhile]") {
Vec ns{3, 4, 5, 6};
auto d = dropwhile([](int i) { return i < 3; }, ns);
Vec v(std::begin(d), std::end(d));
Vec vc = {3, 4, 5, 6};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: skips all elements when all are true under predicate",
"[dropwhile]") {
Vec ns{3, 4, 5, 6};
auto d = dropwhile([](int i) { return i != 0; }, ns);
SECTION("normal compare") {
REQUIRE(std::begin(d) == std::end(d));
}
SECTION("reversed compare") {
REQUIRE(std::end(d) == std::begin(d));
}
}
TEST_CASE("dropwhile: identity", "[dropwhile]") {
Vec ns{1, 2, 0, 3, 1, 0};
auto d = dropwhile(ns);
Vec v(std::begin(d), std::end(d));
Vec vc = {0, 3, 1, 0};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: empty case is empty", "[dropwhile]") {
Vec ns{};
auto d = dropwhile([](int i) { return i != 0; }, ns);
SECTION("normal compare") {
REQUIRE(std::begin(d) == std::end(d));
}
SECTION("reversed compare") {
REQUIRE(std::end(d) == std::begin(d));
}
}
TEST_CASE("dropwhile: only drops from beginning", "[dropwhile]") {
Vec ns{1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1};
auto d = dropwhile([](int i) { return i < 5; }, ns);
Vec v(std::begin(d), std::end(d));
Vec vc = {5, 6, 5, 4, 3, 2, 1};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: operator->", "[dropwhile]") {
std::vector<std::string> vs = {"a", "ab", "abcdef", "abcdefghi"};
auto d = dropwhile([](const std::string& str) { return str.size() < 3; }, vs);
auto it = std::begin(d);
REQUIRE(it->size() == 6);
}
namespace {
int less_than_five(int i) {
return i < 5;
}
}
TEST_CASE("dropwhile: works with function pointer", "[dropwhile]") {
Vec ns{1, 2, 3, 4, 5, 6, 7, 8};
auto d = dropwhile(less_than_five, ns);
Vec v(std::begin(d), std::end(d));
Vec vc = {5, 6, 7, 8};
REQUIRE(v == vc);
}
TEST_CASE("dropwhile: binds to lvalues, moves rvalues", "[dropwhile]") {
itertest::BasicIterable<int> bi{1, 2, 3, 4};
SECTION("binds to lvalues") {
dropwhile(less_than_five, bi);
REQUIRE_FALSE(bi.was_moved_from());
}
SECTION("moves rvalues") {
dropwhile(less_than_five, std::move(bi));
REQUIRE(bi.was_moved_from());
}
}
TEST_CASE(
"dropwhile: doesn't move or copy elements of iterable", "[dropwhile]") {
constexpr itertest::SolidInt arr[] = {{6}, {7}, {8}};
for (auto&& i :
dropwhile([](const itertest::SolidInt&) { return false; }, arr)) {
(void)i;
}
}
TEST_CASE("dropwhile: iterator meets requirements", "[dropwhile]") {
std::string s{};
auto c = dropwhile([] { return true; }, s);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
}
template <typename T, typename U>
using ImpT = decltype(dropwhile(std::declval<T>(), std::declval<U>()));
TEST_CASE("dropwhile: has correct ctor and assign ops", "[dropwhile]") {
using T1 = ImpT<bool (*)(char c), std::string&>;
auto lam = [](char) { return false; };
using T2 = ImpT<decltype(lam), std::string>;
REQUIRE(itertest::IsMoveConstructibleOnly<T1>::value);
REQUIRE(itertest::IsMoveConstructibleOnly<T2>::value);
}