util: Add constexpr int to string conversion class. This will allow us not to have heap allocations when joining ints to string

1 files changed, 12 insertions, 0 deletions

diff --git a/util/string/cast_ut.cpp b/util/string/cast_ut.cpp
index 8690fa78dca..0ff92e379bd 100644
--- a/util/string/cast_ut.cpp
+++ b/util/string/cast_ut.cpp
@@ -587,4 +587,16 @@ Y_UNIT_TEST_SUITE(TCastTest) {
         UNIT_ASSERT_VALUES_EQUAL(ToString(U'я'), "1103");
         UNIT_ASSERT_VALUES_EQUAL(ToString(U'\U0001F600'), "128512"); // 'GRINNING FACE' (U+1F600)
     }
+
+    Y_UNIT_TEST(TestTIntStringBuf) {
+        static_assert(TStringBuf(TIntStringBuf(111)) == TStringBuf("111"));
+        static_assert(TStringBuf(TIntStringBuf(-111)) == TStringBuf("-111"));
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(TIntStringBuf(0)), "0"sv);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(TIntStringBuf(1111)), "1111"sv);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(TIntStringBuf(-1)), "-1"sv);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(TIntStringBuf(-1111)), "-1111"sv);
+
+        constexpr auto v = TIntStringBuf(-1111);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(v), TStringBuf(ToString(-1111)));
+    }
 };