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#include "stack_vec.h"
#include <library/cpp/testing/unittest/registar.h>
namespace {
struct TNotCopyAssignable {
const int Value;
};
static_assert(std::is_copy_constructible_v<TNotCopyAssignable>);
static_assert(!std::is_copy_assignable_v<TNotCopyAssignable>);
template <class T, size_t JunkPayloadSize>
struct TThickAlloc: public std::allocator<T> {
template <class U>
struct rebind {
using other = TThickAlloc<U, JunkPayloadSize>;
};
char Junk[JunkPayloadSize]{sizeof(T)};
};
template <class T>
struct TStatefulAlloc: public std::allocator<T> {
using TBase = std::allocator<T>;
template <class U>
struct rebind {
using other = TStatefulAlloc<U>;
};
TStatefulAlloc(size_t* allocCount)
: AllocCount(allocCount)
{}
size_t* AllocCount;
T* allocate(size_t n)
{
*AllocCount += 1;
return TBase::allocate(n);
}
};
}
Y_UNIT_TEST_SUITE(TStackBasedVectorTest) {
Y_UNIT_TEST(TestCreateEmpty) {
TStackVec<int> ints;
UNIT_ASSERT_EQUAL(ints.size(), 0);
}
Y_UNIT_TEST(TestCreateNonEmpty) {
TStackVec<int> ints(5);
UNIT_ASSERT_EQUAL(ints.size(), 5);
for (size_t i = 0; i < ints.size(); ++i) {
UNIT_ASSERT_EQUAL(ints[i], 0);
}
}
Y_UNIT_TEST(TestReallyOnStack) {
const TStackVec<int> vec(5);
UNIT_ASSERT(
(const char*)&vec <= (const char*)&vec[0] &&
(const char*)&vec[0] <= (const char*)&vec + sizeof(vec)
);
}
Y_UNIT_TEST(TestFallback) {
TSmallVec<int> ints;
for (int i = 0; i < 14; ++i) {
ints.push_back(i);
}
for (size_t i = 0; i < ints.size(); ++i) {
UNIT_ASSERT_EQUAL(ints[i], (int)i);
}
for (int i = 14; i < 20; ++i) {
ints.push_back(i);
}
for (size_t i = 0; i < ints.size(); ++i) {
UNIT_ASSERT_EQUAL(ints[i], (int)i);
}
TSmallVec<int> ints2 = ints;
for (size_t i = 0; i < ints2.size(); ++i) {
UNIT_ASSERT_EQUAL(ints2[i], (int)i);
}
TSmallVec<int> ints3;
ints3 = ints2;
for (size_t i = 0; i < ints3.size(); ++i) {
UNIT_ASSERT_EQUAL(ints3[i], (int)i);
}
}
Y_UNIT_TEST(TestCappedSize) {
TStackVec<int, 8, false> ints;
ints.push_back(1);
ints.push_back(2);
auto intsCopy = ints;
UNIT_ASSERT_VALUES_EQUAL(intsCopy.capacity(), 8);
for (int i = 2; i != 8; ++i) {
intsCopy.push_back(i);
}
// Just verify that the program did not crash.
}
Y_UNIT_TEST(TestCappedSizeWithNotCopyAssignable) {
TStackVec<TNotCopyAssignable, 8, false> values;
values.push_back({1});
values.push_back({2});
auto valuesCopy = values;
UNIT_ASSERT_VALUES_EQUAL(valuesCopy.capacity(), 8);
for (int i = 2; i != 8; ++i) {
valuesCopy.push_back({i});
}
// Just verify that the program did not crash.
}
Y_UNIT_TEST(TestCustomAllocSize) {
constexpr size_t n = 16384;
using TVec = TStackVec<size_t, 1, true, TThickAlloc<size_t, n>>;
UNIT_ASSERT_LT(sizeof(TVec), 1.5 * n);
}
Y_UNIT_TEST(TestStatefulAlloc) {
size_t count = 0;
TStackVec<size_t, 1, true, TStatefulAlloc<size_t>> vec{{ &count }};
for (size_t i = 0; i < 5; ++i) {
vec.push_back(1);
}
UNIT_ASSERT_VALUES_EQUAL(count, 3);
}
}
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