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266 lines (220 loc) · 6.78 KB
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#include <chain.hpp>
#include "helpers.hpp"
#include <iterator>
#include <list>
#include <string>
#include <utility>
#include <vector>
#include "catch.hpp"
using iter::chain;
using itertest::SolidInt;
using itertest::BasicIterable;
using Vec = const std::vector<char>;
TEST_CASE("chain: three strings", "[chain]") {
std::string s1{"abc"};
std::string s2{"mno"};
std::string s3{"xyz"};
auto ch = chain(s1, s2, s3);
Vec v(std::begin(ch), std::end(ch));
Vec vc{'a', 'b', 'c', 'm', 'n', 'o', 'x', 'y', 'z'};
REQUIRE(v == vc);
}
TEST_CASE("chain: with different container types", "[chain]") {
std::string s1{"abc"};
std::list<char> li{'m', 'n', 'o'};
std::vector<char> vec{'x', 'y', 'z'};
auto ch = chain(s1, li, vec);
Vec v(std::begin(ch), std::end(ch));
Vec vc{'a', 'b', 'c', 'm', 'n', 'o', 'x', 'y', 'z'};
REQUIRE(v == vc);
}
TEST_CASE(
"chain: where one container has different begin and end types", "[chain]") {
std::string s1{"abc"};
std::list<char> li{'m', 'n', 'o'};
CharRange cr('e');
auto ch = chain(s1, li, cr);
Vec v(std::begin(ch), std::end(ch));
Vec vc{'a', 'b', 'c', 'm', 'n', 'o', 'a', 'b', 'c', 'd'};
REQUIRE(v == vc);
}
TEST_CASE("chain: handles empty containers", "[chain]") {
std::string emp;
std::string a{"a"};
std::string b{"b"};
std::string c{"c"};
Vec vc{'a', 'b', 'c'};
SECTION("Empty container at front") {
auto ch = chain(emp, a, b, c);
Vec v(std::begin(ch), std::end(ch));
REQUIRE(v == vc);
}
SECTION("Empty container at back") {
auto ch = chain(a, b, c, emp);
Vec v(std::begin(ch), std::end(ch));
REQUIRE(v == vc);
}
SECTION("Empty container in middle") {
auto ch = chain(a, emp, b, emp, c);
Vec v(std::begin(ch), std::end(ch));
REQUIRE(v == vc);
}
SECTION("Consecutive empty containers at front") {
auto ch = chain(emp, emp, a, b, c);
Vec v(std::begin(ch), std::end(ch));
REQUIRE(v == vc);
}
SECTION("Consecutive empty containers at back") {
auto ch = chain(a, b, c, emp, emp);
Vec v(std::begin(ch), std::end(ch));
REQUIRE(v == vc);
}
SECTION("Consecutive empty containers in middle") {
auto ch = chain(a, emp, emp, b, emp, emp, c);
Vec v(std::begin(ch), std::end(ch));
REQUIRE(v == vc);
}
}
TEST_CASE("chain: with only empty containers", "[chain]") {
std::string emp{};
SECTION("one empty container") {
auto ch = chain(emp);
REQUIRE_FALSE(std::begin(ch) != std::end(ch));
}
SECTION("two empty containers") {
auto ch = chain(emp, emp);
REQUIRE_FALSE(std::begin(ch) != std::end(ch));
}
SECTION("three empty containers") {
auto ch = chain(emp, emp, emp);
REQUIRE_FALSE(std::begin(ch) != std::end(ch));
}
}
TEST_CASE("chain: doesn't move or copy elements of iterable", "[chain]") {
constexpr SolidInt arr[] = {{6}, {7}, {8}};
for (auto&& i : chain(arr, arr)) {
(void)i;
}
}
TEST_CASE("chain: binds reference to lvalue and moves rvalue", "[chain]") {
BasicIterable<char> bi{'x', 'y', 'z'};
BasicIterable<char> bi2{'a', 'j', 'm'};
SECTION("First moved, second ref'd") {
chain(std::move(bi), bi2);
REQUIRE(bi.was_moved_from());
REQUIRE_FALSE(bi2.was_moved_from());
}
SECTION("First ref'd, second moved") {
chain(bi, std::move(bi2));
REQUIRE_FALSE(bi.was_moved_from());
REQUIRE(bi2.was_moved_from());
}
}
TEST_CASE("chain: operator==", "[chain]") {
std::string emp{};
auto ch = chain(emp);
REQUIRE(std::begin(ch) == std::end(ch));
}
TEST_CASE("chain: postfix ++", "[chain]") {
std::string s1{"a"}, s2{"b"};
auto ch = chain(s1, s2);
auto it = std::begin(ch);
it++;
REQUIRE(*it == 'b');
}
TEST_CASE("chain: iterator meets requirements", "[chain]") {
Vec ns{};
auto c = chain(ns, ns);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
}
template <typename... Ts>
using ImpT = decltype(chain(std::declval<Ts>()...));
TEST_CASE("chain: has correct ctor and assign ops", "[chain]") {
using T = ImpT<std::string&, std::vector<char>, char(&)[10]>;
REQUIRE(itertest::IsMoveConstructibleOnly<T>::value);
}
TEST_CASE("chain.from_iterable: basic test", "[chain.from_iterable]") {
std::vector<std::string> sv{"abc", "xyz"};
std::vector<char> v;
SECTION("Normal call") {
auto ch = chain.from_iterable(sv);
v.assign(std::begin(ch), std::end(ch));
}
SECTION("Pipe") {
auto ch = sv | chain.from_iterable;
v.assign(std::begin(ch), std::end(ch));
}
std::vector<char> vc{'a', 'b', 'c', 'x', 'y', 'z'};
REQUIRE(v == vc);
}
TEST_CASE("chain.fromm_iterable: Works with different begin and end types",
"[chain.from_iterable]") {
std::vector<CharRange> crv = {{'c'}, {'d'}};
auto ch = chain.from_iterable(crv);
const std::vector<char> v(std::begin(ch), std::end(ch));
const std::vector<char> vc = {'a', 'b', 'a', 'b', 'c'};
REQUIRE(v == vc);
}
TEST_CASE(
"chain.from_iterable: iterators cant be copy constructed "
"and assigned",
"[chain.from_iterable]") {
std::vector<std::string> sv{"abc", "xyz"};
auto ch = chain.from_iterable(sv);
auto it = std::begin(ch);
SECTION("Copy constructed") {
auto it2 = it;
++it;
REQUIRE(it != it2);
}
SECTION("Copy assigned") {
auto it2 = std::end(ch);
it2 = it;
REQUIRE(it == it2);
}
}
TEST_CASE("chain.from_iterable: postfix ++", "[chain.from_iterable]") {
std::vector<std::string> sv{"a", "n"};
auto ch = chain.from_iterable(sv);
auto it = std::begin(ch);
it++;
REQUIRE(*it == 'n');
}
TEST_CASE("chain.from_iterable: operator->", "[chain.from_iterable]") {
std::vector<std::vector<std::string>> sv{{"a", "ab"}, {"abc"}};
auto ch = chain.from_iterable(sv);
auto it = std::begin(ch);
REQUIRE(it->size() == 1);
}
TEST_CASE("chain.from_iterable: moves rvalues and binds ref to lvalues",
"[chain.from_iterable]") {
BasicIterable<std::string> bi{"abc", "xyz"};
SECTION("Moves rvalue") {
chain.from_iterable(std::move(bi));
REQUIRE(bi.was_moved_from());
}
SECTION("Binds ref to lvalue") {
chain.from_iterable(bi);
REQUIRE_FALSE(bi.was_moved_from());
}
}
TEST_CASE("chain.from_iterable: empty", "[chain.from_iterable]") {
const std::vector<std::string> v{};
auto ch = chain.from_iterable(v);
REQUIRE(std::begin(ch) == std::end(ch));
}
TEST_CASE("chain.from_iterable: iterator meets requirements",
"[chain.from_iterable]") {
const std::vector<std::string> v{};
auto c = chain.from_iterable(v);
REQUIRE(itertest::IsIterator<decltype(std::begin(c))>::value);
}
template <typename T>
using ImpT2 = decltype(chain.from_iterable(std::declval<T>()));
TEST_CASE("chain.from_iterable: has correct ctor and assign ops",
"[chain.from_iterable]") {
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT2<std::vector<std::string>>>::
value);
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT2<std::vector<std::string>&>>::
value);
}