restructure project

include/td/misc/Format.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <string>
+#include <memory>
+#include <stdexcept>
+
+namespace td {
+namespace utils {
+
+template <typename... Args>
+std::string format(const std::string& format, Args... args) {
+	int size = snprintf(nullptr, 0, format.c_str(), args...) + 1; // Extra space for '\0'
+	if (size <= 0) {
+		throw std::runtime_error("Error during formatting.");
+	}
+	std::unique_ptr<char[]> buf(new char[size]);
+	snprintf(buf.get(), static_cast<std::size_t>(size), format.c_str(), args...);
+	return std::string(buf.get(), buf.get() + size - 1); // We don't want the '\0' inside
+}
+
+} // namespace utils
+} // namespace td
+