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Copy pathtest_accumulate.cpp
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168 lines (144 loc) · 4.61 KB
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#include <cppitertools/accumulate.hpp>
#include "helpers.hpp"
#include <iterator>
#include <string>
#include <vector>
#include "catch.hpp"
using iter::accumulate;
using itertest::BasicIterable;
using Vec = const std::vector<int>;
TEST_CASE("Simple sum", "[accumulate]") {
Vec ns{1, 2, 3, 4, 5};
std::vector<int> v;
SECTION("Normal call") {
auto a = accumulate(ns);
v.assign(std::begin(a), std::end(a));
}
SECTION("Pipe") {
auto a = ns | accumulate;
v.assign(std::begin(a), std::end(a));
}
Vec vc{1, 3, 6, 10, 15};
REQUIRE(v == vc);
}
TEST_CASE("accumulate: With subtraction lambda", "[accumulate]") {
Vec ns{5, 4, 3, 2, 1};
std::vector<int> v;
SECTION("Normal call") {
auto a = accumulate(ns, [](int a, int b) { return a - b; });
v.assign(std::begin(a), std::end(a));
}
SECTION("Pipe") {
auto a = ns | accumulate([](int a, int b) { return a - b; });
v.assign(std::begin(a), std::end(a));
}
Vec vc{5, 1, -2, -4, -5};
REQUIRE(v == vc);
}
TEST_CASE("accumulate: handles pointer to member function", "[accumulate]") {
using itertest::Point;
std::vector<Point> ps = {{1, 2}, {10, 50}, {300, 600}};
auto a = accumulate(ps, &Point::add);
const std::vector<Point> v(std::begin(a), std::end(a));
const std::vector<Point> vc = {{1, 2}, {11, 52}, {311, 652}};
REQUIRE(v == vc);
}
TEST_CASE("accumulate: const iterators", "[accumulate][const]") {
std::vector<int> v;
SECTION("lvalue") {
Vec ns{1, 2, 3, 4, 5};
const auto a = accumulate(ns);
v.assign(std::begin(a), std::end(a));
}
SECTION("rvalue") {
const auto a = accumulate(Vec{1, 2, 3, 4, 5});
v.assign(std::begin(a), std::end(a));
}
SECTION("const lvalue") {
const Vec ns{1, 2, 3, 4, 5};
const auto a = accumulate(ns);
v.assign(std::begin(a), std::end(a));
}
Vec vc{1, 3, 6, 10, 15};
REQUIRE(v == vc);
}
TEST_CASE(
"accumulate: const iterators can be compared", "[accumulate][const]") {
auto e = accumulate(std::string("hello"));
const auto& ce = e;
(void)(std::begin(e) == std::end(ce));
}
struct Integer {
const int value;
constexpr Integer(int i) : value{i} {}
constexpr Integer operator+(Integer other) const noexcept {
return {this->value + other.value};
}
};
TEST_CASE("accumulate: intermidate type need not be default constructible",
"[accumulate]") {
std::vector<Integer> v = {{2}, {3}, {10}};
auto a = accumulate(v, std::plus<Integer>{});
(void)std::begin(a);
}
TEST_CASE("accumulate: binds reference when it should", "[accumulate]") {
BasicIterable<int> bi{1, 2};
accumulate(bi);
REQUIRE_FALSE(bi.was_moved_from());
}
TEST_CASE("accumulate: moves rvalues when it should", "[accumulate]") {
BasicIterable<int> bi{1, 2};
accumulate(std::move(bi));
REQUIRE(bi.was_moved_from());
}
TEST_CASE("accumulate: operator==", "[accumulate]") {
Vec v;
auto a = accumulate(v);
REQUIRE(std::begin(a) == std::end(a));
}
TEST_CASE("accumulate: postfix ++", "[accumulate]") {
Vec ns{2, 3};
auto a = accumulate(ns);
auto it = std::begin(a);
it++;
REQUIRE(*it == 5);
}
TEST_CASE("accumulate: operator->", "[accumulate]") {
Vec ns{7, 3};
auto a = accumulate(ns);
auto it = std::begin(a);
const int* p = it.operator->();
REQUIRE(*p == 7);
}
TEST_CASE("accumulate: iterator meets requirements", "[accumulate]") {
std::vector<int> ns{};
SECTION("with reference return type") {
auto acc = accumulate(ns, [](int& a, int&) -> int& { return a; });
REQUIRE(itertest::IsIterator<decltype(std::begin(acc))>::value);
REQUIRE(itertest::ReferenceMatchesDeref<decltype(std::begin(acc))>::value);
}
SECTION("with const reference return type") {
auto acc = accumulate(ns, [](int& a, int&) -> const int& { return a; });
REQUIRE(itertest::IsIterator<decltype(std::begin(acc))>::value);
REQUIRE(itertest::ReferenceMatchesDeref<decltype(std::begin(acc))>::value);
}
SECTION("with value return type") {
auto acc = accumulate(ns, [](int a, int) -> int { return a; });
REQUIRE(itertest::IsIterator<decltype(std::begin(acc))>::value);
REQUIRE(itertest::ReferenceMatchesDeref<decltype(std::begin(acc))>::value);
}
}
TEST_CASE(
"accumulate: Works with different begin and end types", "[accumulate]") {
CharRange cr{'d'};
auto a = accumulate(cr);
Vec v(a.begin(), a.end());
Vec vc{'a', 'a' + 'b', 'a' + 'b' + 'c'};
REQUIRE(v == vc);
}
template <typename T>
using ImpT = decltype(accumulate(std::declval<T>()));
TEST_CASE("accumulate: has correct ctor and assign ops", "[accumulate]") {
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT<std::string&>>::value);
REQUIRE(itertest::IsMoveConstructibleOnly<ImpT<std::string>>::value);
}