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test_iterators.cc
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/**
* @file test_zip_iterator.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Jul 21 2017
* @date last modification: Fri Dec 08 2017
*
* @brief test the zip container and iterator
*
* @section LICENSE
*
* Copyright (©) 2016-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* akantu-iterators is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* akantu-iterators is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with akantu-iterators. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_iterators.hh"
/* -------------------------------------------------------------------------- */
#include <gtest/gtest.h>
#include <vector>
/* -------------------------------------------------------------------------- */
using namespace aka;
/* -------------------------------------------------------------------------- */
// Non Trivial class that counts moves and copies
template <class T> class A {
public:
A() = default;
A(T a) : a(a){};
A(const A & other)
: a(other.a), copy_counter(other.copy_counter + 1),
move_counter(other.move_counter) {}
A & operator=(const A & other) {
if (this != &other) {
a = other.a;
copy_counter = other.copy_counter + 1;
}
return *this;
}
A(A && other)
: a(std::move(other.a)), copy_counter(std::move(other.copy_counter)),
move_counter(std::move(other.move_counter) + 1) {}
A & operator=(A && other) {
if (this != &other) {
a = std::move(other.a);
copy_counter = std::move(other.copy_counter);
move_counter = std::move(other.move_counter) + 1;
}
return *this;
}
A & operator*=(const T & b) {
a *= b;
return *this;
}
T a{};
size_t copy_counter{0};
size_t move_counter{0};
};
template <typename T> struct C {
struct iterator {
using reference = A<T>;
using difference_type = void;
using iterator_category = std::input_iterator_tag;
using value_type = A<T>;
using pointer = A<T> *;
iterator(T pos) : pos(std::move(pos)) {}
A<T> operator*() { return A<int>(pos); }
bool operator!=(const iterator & other) const { return pos != other.pos; }
bool operator==(const iterator & other) const { return pos == other.pos; }
iterator & operator++() {
++pos;
return *this;
}
T pos;
};
C(T begin_, T end_) : begin_(std::move(begin_)), end_(std::move(end_)) {}
iterator begin() { return iterator(begin_); }
iterator end() { return iterator(end_); }
T begin_, end_;
};
class TestZipFixutre : public ::testing::Test {
protected:
void SetUp() override {
a.reserve(size);
b.reserve(size);
for (size_t i = 0; i < size; ++i) {
a.emplace_back(i);
b.emplace_back(i + size);
}
}
template <typename A, typename B>
void check(A && a, B && b, size_t pos, size_t nb_copy, size_t nb_move) {
EXPECT_EQ(pos, a.a);
EXPECT_EQ(nb_copy, a.copy_counter);
EXPECT_EQ(nb_move, a.move_counter);
EXPECT_FLOAT_EQ(pos + this->size, b.a);
EXPECT_EQ(nb_copy, b.copy_counter);
EXPECT_EQ(nb_move, b.move_counter);
}
protected:
size_t size{20};
std::vector<A<int>> a{};
std::vector<A<float>> b{};
};
TEST_F(TestZipFixutre, SimpleTest) {
size_t i = 0;
for (auto && pair : zip(this->a, this->b)) {
this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 0);
++i;
}
}
TEST_F(TestZipFixutre, ConstTest) {
size_t i = 0;
const auto & ca = this->a;
const auto & cb = this->b;
for (auto && pair : zip(ca, cb)) {
this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 0);
EXPECT_EQ(true,
std::is_const<
std::remove_reference_t<decltype(std::get<0>(pair))>>::value);
EXPECT_EQ(true,
std::is_const<
std::remove_reference_t<decltype(std::get<1>(pair))>>::value);
++i;
}
}
TEST_F(TestZipFixutre, MixteTest) {
size_t i = 0;
const auto & cb = this->b;
for (auto && pair : zip(a, cb)) {
this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 0);
EXPECT_EQ(false,
std::is_const<
std::remove_reference_t<decltype(std::get<0>(pair))>>::value);
EXPECT_EQ(true,
std::is_const<
std::remove_reference_t<decltype(std::get<1>(pair))>>::value);
++i;
}
}
TEST_F(TestZipFixutre, MoveTest) {
size_t i = 0;
for (auto && pair :
zip(C<int>(0, this->size), C<int>(this->size, 2 * this->size))) {
this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 1);
++i;
}
}
TEST_F(TestZipFixutre, Bidirectional) {
auto _zip = zip(a, b);
auto begin = _zip.begin();
auto it = begin;
++it;
EXPECT_EQ(begin, --it);
it = begin;
EXPECT_EQ(begin, it++);
EXPECT_EQ(begin, --it);
auto it2 = it = begin;
++it;
++it2;
EXPECT_EQ(it2, it--);
EXPECT_EQ(begin, it);
}
TEST_F(TestZipFixutre, RandomAccess) {
auto _zip = zip(a, b);
auto begin = _zip.begin();
auto end = _zip.end();
auto && val5 = begin[5];
this->check(std::get<0>(val5), std::get<1>(val5), 5, 0, 0);
auto && val13 = begin[13];
this->check(std::get<0>(val13), std::get<1>(val13), 13, 0, 0);
EXPECT_EQ(end - begin, a.size());
auto it = ++begin;
EXPECT_EQ(begin + 1, ++it);
EXPECT_EQ(begin, it - 1);
}
TEST_F(TestZipFixutre, Cat) {
size_t i = 0;
for (auto && data : make_zip_cat(zip(a, b), zip(a, b))) {
this->check(std::get<0>(data), std::get<1>(data), i, 0, 0);
this->check(std::get<2>(data), std::get<3>(data), i, 0, 0);
++i;
}
}
/* -------------------------------------------------------------------------- */
TEST(TestArangeIterator, Stop) {
size_t ref_i = 0;
for (auto i : arange(10)) {
EXPECT_EQ(ref_i, i);
++ref_i;
}
}
TEST(TestArangeIterator, StartStop) {
size_t ref_i = 1;
for (auto i : arange(1, 10)) {
EXPECT_EQ(ref_i, i);
++ref_i;
}
}
TEST(TestArangeIterator, StartStopStep) {
size_t ref_i = 1;
for (auto i : arange(1, 22, 2)) {
EXPECT_EQ(ref_i, i);
ref_i += 2;
}
}
TEST(TestArangeIterator, StartStopStepZipped) {
int ref_i1 = -1, ref_i2 = 1;
for (auto && i : zip(arange(-1, -10, -1), arange(1, 18, 2))) {
EXPECT_EQ(ref_i1, std::get<0>(i));
EXPECT_EQ(ref_i2, std::get<1>(i));
ref_i1 += -1;
ref_i2 += 2;
}
}
/* -------------------------------------------------------------------------- */
TEST(TestEnumerateIterator, SimpleTest) {
std::vector<int> a{0, 10, 20, 30, 40};
std::vector<int> b{0, 2, 4, 6, 8};
for (auto && data : enumerate(a, b)) {
EXPECT_EQ(std::get<0>(data) * 10, std::get<1>(data));
EXPECT_EQ(std::get<0>(data) * 2, std::get<2>(data));
}
}
/* -------------------------------------------------------------------------- */
TEST(TestTransformAdaptor, Keys) {
std::map<std::string, int> map{
{"1", 1}, {"2", 2}, {"3", 3}, {"3", 3}, {"4", 4}};
char counter = '1';
for (auto && key : make_keys_adaptor(map)) {
EXPECT_EQ(counter, key[0]);
++counter;
}
}
TEST(TestTransformAdaptor, Values) {
std::map<std::string, int> map{
{"1", 1}, {"2", 2}, {"3", 3}, {"3", 3}, {"4", 4}};
int counter = 1;
for (auto && value : make_values_adaptor(map)) {
EXPECT_EQ(counter, value);
++counter;
}
}
static int plus1(int value) { return value + 1; }
struct Plus {
Plus(int a) : a(a) {}
int operator()(int b) { return a + b; }
private:
int a{0};
};
TEST(TestTransformAdaptor, Lambda) {
auto && container = arange(10);
for (auto && data :
zip(container, make_transform_adaptor(container, [](auto && value) {
return value + 1;
}))) {
EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
}
}
TEST(TestTransformAdaptor, LambdaLambda) {
std::map<std::string, int> map{
{"1", 1}, {"2", 2}, {"3", 3}, {"3", 3}, {"4", 4}};
int counter = 1;
for (auto && data : make_transform_adaptor(
make_values_adaptor(map), [](auto && value) { return value + 1; })) {
EXPECT_EQ(counter + 1, data);
++counter;
}
auto && container = arange(10);
for (auto && data :
zip(container, make_transform_adaptor(container, [](auto && value) {
return value + 1;
}))) {
EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
}
}
TEST(TestTransformAdaptor, Function) {
auto && container = arange(10);
for (auto && data :
zip(container, make_transform_adaptor(container, plus1))) {
EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
}
}
TEST(TestTransformAdaptor, Functor) {
auto && container = arange(10);
for (auto && data :
zip(container, make_transform_adaptor(container, Plus(1)))) {
EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
}
}
/* -------------------------------------------------------------------------- */
TEST(TestFilteredIterator, Simple) {
std::vector<int> values{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
std::vector<int> filter_{1, 3, 4, 10, 8, 6};
for (auto && data : zip(filter_, filter(filter_, values))) {
EXPECT_EQ(std::get<0>(data), std::get<1>(data));
}
}
/* -------------------------------------------------------------------------- */
TEST(TestFilteredIterator, Temporary) {
std::vector<int> filter_{1, 3, 4, 10, 8, 6};
for (auto && data :
zip(filter_, filter(filter_, std::vector<int>{0, 1, 2, 3, 4, 5, 6, 7, 8,
9, 10}))) {
EXPECT_EQ(std::get<0>(data), std::get<1>(data));
}
}

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