Explicitly use TCowString in TYsonString

Для ревьюеров: изменения вне `library/cpp/yt` убирают `using namespace NYT` из хедера. Эта конструкция приводила к клешу имен глобального неймспейса и  `NYT` и ошибкам сборки.
commit_hash:f598da488a6dd8671af9f1f02870ab5612ae46eb

1 files changed, 46 insertions, 0 deletions

diff --git a/library/cpp/containers/cow_string/output.cpp b/library/cpp/containers/cow_string/output.cpp
new file mode 100644
index 00000000000..e0b4924ad31
--- /dev/null
+++ b/library/cpp/containers/cow_string/output.cpp
@@ -0,0 +1,46 @@
+#include "cow_string.h"
+
+#include <util/charset/wide.h>
+#include <util/stream/input.h>
+#include <util/string/cast.h>
+
+constexpr size_t MAX_UTF8_BYTES = 4; // UTF-8-encoded code point takes between 1 and 4 bytes
+
+template <typename TCharType>
+static void WriteString(IOutputStream& o, const TCharType* w, size_t n) {
+    const size_t buflen = (n * MAX_UTF8_BYTES); // * 4 because the conversion functions can convert unicode character into maximum 4 bytes of UTF8
+    TTempBuf buffer(buflen + 1);
+    size_t written = 0;
+    WideToUTF8(w, n, buffer.Data(), written);
+    o.Write(buffer.Data(), written);
+}
+
+template <>
+void Out<TCowString>(IOutputStream& o, const TCowString& p) {
+    o.Write(p.data(), p.size());
+}
+
+template <>
+void Out<TUtf16CowString>(IOutputStream& o, const TUtf16CowString& w) {
+    WriteString(o, w.c_str(), w.size());
+}
+
+template <>
+void Out<TUtf32CowString>(IOutputStream& o, const TUtf32CowString& w) {
+    WriteString(o, w.c_str(), w.size());
+}
+
+template <>
+void Out<TBasicCharRef<TCowString>>(IOutputStream& o, const TBasicCharRef<TCowString>& c) {
+    o << static_cast<char>(c);
+}
+
+template <>
+void Out<TBasicCharRef<TUtf16CowString>>(IOutputStream& o, const TBasicCharRef<TUtf16CowString>& c) {
+    o << static_cast<wchar16>(c);
+}
+
+template <>
+void Out<TBasicCharRef<TUtf32CowString>>(IOutputStream& o, const TBasicCharRef<TUtf32CowString>& c) {
+    o << static_cast<wchar32>(c);
+}