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diff --git a/include/salticidae/type.h b/include/salticidae/type.h
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+++ b/include/salticidae/type.h
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+/**
+ * Copyright (c) 2018 Cornell University.
+ *
+ * Author: Ted Yin <tederminant@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _SALTICIDAE_TYPE_H
+#define _SALTICIDAE_TYPE_H
+
+#include <vector>
+#include <string>
+#include <cstring>
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <ios>
+#include <functional>
+#include <mutex>
+
+namespace salticidae {
+
+const auto _1 = std::placeholders::_1;
+const auto _2 = std::placeholders::_2;
+
+using bytearray_t = std::vector<uint8_t>;
+using mutex_lg_t = std::lock_guard<std::mutex>;
+using mutex_ul_t = std::unique_lock<std::mutex>;
+
+template<typename T> T htole(T) = delete;
+template<> inline uint16_t htole<uint16_t>(uint16_t x) { return htole16(x); }
+template<> inline uint32_t htole<uint32_t>(uint32_t x) { return htole32(x); }
+template<> inline uint64_t htole<uint64_t>(uint64_t x) { return htole64(x); }
+
+template<typename T> T letoh(T) = delete;
+template<> inline uint16_t letoh<uint16_t>(uint16_t x) { return le16toh(x); }
+template<> inline uint32_t letoh<uint32_t>(uint32_t x) { return le32toh(x); }
+template<> inline uint64_t letoh<uint64_t>(uint64_t x) { return le64toh(x); }
+
+template <typename T, typename = void>
+struct is_ranged : std::false_type {};
+
+template <typename T>
+struct is_ranged<T,
+    std::void_t<decltype(std::declval<T>().begin()),
+                decltype(std::declval<T>().end())>> : std::true_type {};
+
+}
+
+#endif