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#include "lazy_value.h"
#include <library/cpp/testing/unittest/registar.h>
Y_UNIT_TEST_SUITE(TLazyValueTestSuite) {
Y_UNIT_TEST(TestLazyValue) {
TLazyValue<int> value([]() {
return 5;
});
UNIT_ASSERT(!value);
UNIT_ASSERT_EQUAL(*value, 5);
UNIT_ASSERT(value);
}
Y_UNIT_TEST(TestLazyValueInitialization) {
TLazyValue<int> value1([]() { return 5; });
TLazyValue<int> value2 = []() { return 5; };
TLazyValue<int> notInitialized{};
TLazyValue<int> copy1(value1);
copy1 = value2;
}
Y_UNIT_TEST(TestLazyValueCopy) {
TLazyValue<int> value([]() { return 5; });
UNIT_ASSERT(!value);
TLazyValue<int> emptyCopy = value;
UNIT_ASSERT(!emptyCopy);
UNIT_ASSERT_EQUAL(*emptyCopy, 5);
UNIT_ASSERT(emptyCopy);
UNIT_ASSERT(!value);
UNIT_ASSERT_EQUAL(*value, 5);
TLazyValue<int> notEmptyCopy = value;
UNIT_ASSERT(notEmptyCopy);
UNIT_ASSERT_EQUAL(*notEmptyCopy, 5);
}
struct TCopyCounter {
TCopyCounter(size_t& numCopies)
: NumCopies(&numCopies)
{
}
TCopyCounter() = default;
TCopyCounter(const TCopyCounter& other)
: NumCopies(other.NumCopies)
{
++(*NumCopies);
}
TCopyCounter(TCopyCounter&&) = default;
TCopyCounter& operator=(const TCopyCounter& other) {
if (this == &other) {
return *this;
}
NumCopies = other.NumCopies;
++(*NumCopies);
return *this;
}
TCopyCounter& operator=(TCopyCounter&&) = default;
size_t* NumCopies = nullptr;
};
Y_UNIT_TEST(TestLazyValueMoveValueInitialization) {
size_t numCopies = 0;
TCopyCounter counter{numCopies};
TLazyValue<TCopyCounter> value{[v = std::move(counter)]() mutable { return std::move(v); }};
value.InitDefault();
UNIT_ASSERT_EQUAL(numCopies, 0);
}
Y_UNIT_TEST(TestLazyValueCopyValueInitialization) {
size_t numCopies = 0;
TCopyCounter counter{numCopies};
TLazyValue<TCopyCounter> value{[&counter]() { return counter; }};
UNIT_ASSERT_EQUAL(numCopies, 0);
value.InitDefault();
UNIT_ASSERT_EQUAL(numCopies, 1);
}
class TValueProvider {
public:
static size_t CountParseDataCalled;
TValueProvider()
: Data_([&] { return this->ParseData(); })
{
}
const TString& GetData() const {
return *Data_;
}
private:
TLazyValue<TString> Data_;
TString ParseData() {
CountParseDataCalled++;
return "hi";
}
};
size_t TValueProvider::CountParseDataCalled = 0;
Y_UNIT_TEST(TestValueProvider) {
TValueProvider provider;
UNIT_ASSERT(provider.GetData() == "hi");
}
Y_UNIT_TEST(TestValueProviderCopy) {
TValueProvider provider;
provider.GetData();
const auto countParsed = TValueProvider::CountParseDataCalled;
provider.GetData();
UNIT_ASSERT_EQUAL(countParsed, TValueProvider::CountParseDataCalled);
TValueProvider providerCopy;
providerCopy = provider;
providerCopy.GetData();
UNIT_ASSERT_EQUAL(countParsed, TValueProvider::CountParseDataCalled);
}
Y_UNIT_TEST(TestEmptyProviderCopy) {
TValueProvider provider;
TValueProvider copy(provider);
const auto countParsed = TValueProvider::CountParseDataCalled;
provider.GetData();
UNIT_ASSERT_EQUAL(countParsed + 1, TValueProvider::CountParseDataCalled);
copy.GetData();
UNIT_ASSERT_EQUAL(countParsed + 2, TValueProvider::CountParseDataCalled);
const TValueProvider notEmptyCopy(copy);
notEmptyCopy.GetData();
UNIT_ASSERT_EQUAL(countParsed + 2, TValueProvider::CountParseDataCalled);
}
Y_UNIT_TEST(TestMakeLazy) {
auto lv = MakeLazy([] {
return 100500;
});
UNIT_ASSERT(!lv);
UNIT_ASSERT(lv.GetRef() == 100500);
UNIT_ASSERT(lv);
}
}
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