Move vector and pair formatting functions to StringBuilder.

tdutils/td/utils/StringBuilder.h

@@ -13,12 +13,14 @@
 #include <cstdlib>
 #include <memory>
 #include <type_traits>
+#include <utility>
 
 namespace td {
 
 class StringBuilder {
  public:
   explicit StringBuilder(MutableSlice slice, bool use_buffer = false);
+
   StringBuilder() : StringBuilder({}, true) {
   }
 
@@ -126,6 +128,36 @@ class StringBuilder {
 
   StringBuilder &operator<<(const void *ptr);
 
+  template <class A, class B>
+  StringBuilder &operator<<(const std::pair<A, B> &p) {
+    return *this << '[' << p.first << ';' << p.second << ']';
+  }
+
+  template <class T>
+  StringBuilder &operator<<(const vector<T> &v) {
+    *this << '{';
+    if (!v.empty()) {
+      *this << v[0];
+      size_t len = v.size();
+      for (size_t i = 1; i < len; i++) {
+        *this << ", " << v[i];
+      }
+    }
+    return *this << '}';
+  }
+
+  StringBuilder &operator<<(const vector<bool> &v) {
+    *this << '{';
+    if (!v.empty()) {
+      *this << v[0];
+      size_t len = v.size();
+      for (size_t i = 1; i < len; i++) {
+        *this << ", " << static_cast<bool>(v[i]);
+      }
+    }
+    return *this << '}';
+  }
+
  private:
   char *begin_ptr_;
   char *current_ptr_;

tdutils/td/utils/format.h

@@ -325,14 +325,4 @@ Lambda<LambdaT> lambda(const LambdaT &lambda) {
 
 using format::tag;
 
-template <class A, class B>
-StringBuilder &operator<<(StringBuilder &sb, const std::pair<A, B> &p) {
-  return sb << '[' << p.first << ';' << p.second << ']';
-}
-
-template <class T>
-StringBuilder &operator<<(StringBuilder &stream, const vector<T> &vec) {
-  return stream << format::as_array(vec);
-}
-
 }  // namespace td