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Copy pathtest_accumulate.cpp
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110 lines (92 loc) · 2.7 KB
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#include <accumulate.hpp>
#include "helpers.hpp"
#include <vector>
#include <iterator>
#include <string>
#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);
}
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>{});
auto it = 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]") {
Vec ns{};
auto a = accumulate(ns, [](int a, int b) { return a + b; });
auto it = std::begin(a);
it = std::begin(a);
REQUIRE(itertest::IsIterator<decltype(std::begin(a))>::value);
}
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);
}