Merge branch 'rightlib' into merge-libs-250306-0050

2 files changed, 56 insertions, 3 deletions

diff --git a/library/cpp/containers/compact_vector/compact_vector.h b/library/cpp/containers/compact_vector/compact_vector.h
index 984ec6ac00d..cff5345ee22 100644
--- a/library/cpp/containers/compact_vector/compact_vector.h
+++ b/library/cpp/containers/compact_vector/compact_vector.h
@@ -113,6 +113,14 @@ public:
         return *this;
     }
 
+    bool operator==(const TCompactVector<T>& other) const {
+        return size() == other.size() && std::equal(begin(), end(), other.begin());
+    }
+
+    explicit operator bool() const {
+        return !empty();
+    }
+
     TIterator Begin() {
         return Ptr;
     }
@@ -218,15 +226,25 @@ public:
     }
 
     void PushBack(const T& elem) {
-        Reserve(Size() + 1);
-        new (Ptr + Size()) T(elem);
-        ++(Header()->Size);
+        EmplaceBack(elem);
     }
 
     void push_back(const T& elem) {
         PushBack(elem);
     }
 
+    template <class... Args>
+    void EmplaceBack(Args&&... args) {
+        Reserve(Size() + 1);
+        new (Ptr + Size()) T(std::forward<Args>(args)...);
+        ++(Header()->Size);
+    }
+
+    template <class... Args>
+    void emplace_back(Args&&... args) {
+        EmplaceBack(std::forward<Args>(args)...);
+    }
+
     T& Back() {
         return *(End() - 1);
     }
diff --git a/library/cpp/containers/compact_vector/compact_vector_ut.cpp b/library/cpp/containers/compact_vector/compact_vector_ut.cpp
index 4dba7b2f49e..5aac5303f32 100644
--- a/library/cpp/containers/compact_vector/compact_vector_ut.cpp
+++ b/library/cpp/containers/compact_vector/compact_vector_ut.cpp
@@ -2,6 +2,8 @@
 
 #include "compact_vector.h"
 
+#include <string>
+
 Y_UNIT_TEST_SUITE(TCompactVectorTest) {
     Y_UNIT_TEST(TestSimple1) {
     }
@@ -44,6 +46,28 @@ Y_UNIT_TEST_SUITE(TCompactVectorTest) {
         UNIT_ASSERT_VALUES_EQUAL(11u, vector[11]);
     }
 
+    Y_UNIT_TEST(TestEmplace) {
+        struct TFoo {
+            explicit TFoo(int)
+                : ConstructedFrom("int")
+            {
+            }
+
+            explicit TFoo(char)
+                : ConstructedFrom("char")
+            {
+            }
+
+            std::string ConstructedFrom;
+        };
+
+        TCompactVector<TFoo> vector;
+        vector.emplace_back(123);
+        UNIT_ASSERT_VALUES_EQUAL(vector.back().ConstructedFrom, "int");
+        vector.emplace_back('c');
+        UNIT_ASSERT_VALUES_EQUAL(vector.back().ConstructedFrom, "char");
+    }
+
     Y_UNIT_TEST(TestInitializerListConstructor) {
         TCompactVector<ui32> vector = { 4, 8, 10, 3, 5};
         UNIT_ASSERT_VALUES_EQUAL(5u, vector.Size());
@@ -146,4 +170,15 @@ Y_UNIT_TEST_SUITE(TCompactVectorTest) {
         UNIT_ASSERT_VALUES_EQUAL(vector[1], vector2[1]);
         UNIT_ASSERT_VALUES_EQUAL(vector[2], vector2[2]);
     }
+
+    Y_UNIT_TEST(TestComparison) {
+        // UNIT_ASSERT_VALUES_EQUAL needs a specialization for Out(), so we just use bool assertions
+        TCompactVector<int> vector {1, 2, 3};
+        TCompactVector<int> vector2 {1, 2};
+        UNIT_ASSERT(vector != vector2);  // diff size
+        vector2.emplace_back(4);
+        UNIT_ASSERT(vector != vector2);  // diff values
+        vector2.back() = 3;
+        UNIT_ASSERT(vector == vector2);
+    }
 }