First Commit

ext/libpqxx-7.7.3/install/ubuntu22.04/amd64/include/pqxx/internal/concat.hxx

@@ -0,0 +1,45 @@
+#if !defined(PQXX_CONCAT_HXX)
+#  define PQXX_CONCAT_HXX
+
+#  include <string>
+#  include <string_view>
+
+#  include "pqxx/strconv.hxx"
+
+namespace pqxx::internal
+{
+/// Convert item to a string, write it into [here, end).
+template<typename TYPE>
+void render_item(TYPE const &item, char *&here, char *end)
+{
+  here = string_traits<TYPE>::into_buf(here, end, item) - 1;
+}
+
+
+// C++20: Support non-random_access_range ranges.
+/// Efficiently combine a bunch of items into one big string.
+/** Use this as an optimised version of string concatentation.  It takes just
+ * about any type; it will represent each item as a string according to its
+ * @ref string_traits.
+ *
+ * This is a simpler, more specialised version of @ref separated_list for a
+ * statically known series of items, possibly of different types.
+ */
+template<typename... TYPE>
+[[nodiscard]] inline std::string concat(TYPE... item)
+{
+  std::string buf;
+  // Size to accommodate string representations of all inputs, minus their
+  // terminating zero bytes.
+  buf.resize(size_buffer(item...));
+
+  char *const data{buf.data()};
+  char *here = data;
+  char *end = data + std::size(buf);
+  (render_item(item, here, end), ...);
+
+  buf.resize(static_cast<std::size_t>(here - data));
+  return buf;
+}
+} // namespace pqxx::internal
+#endif