diff --git a/CMakeLists.txt b/CMakeLists.txt
index 34c7d72..511b150 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_STANDARD_EXTENSIONS OFF)
 
 option(SLED_BUILD_BENCHMARK "Build benchmark" OFF)
+option(SLED_BUILD_TESTS "Build tests" OFF)
 
 set(BUILD_STATIC ON)
 set(BUILD_RTTR_DYNAMIC OFF)
@@ -61,3 +62,8 @@ if(SLED_BUILD_BENCHMARK)
     target_link_libraries(sled_benchmark PRIVATE sled benchmark::benchmark
                                                benchmark::benchmark_main)
 endif(SLED_BUILD_BENCHMARK)
+
+if(SLED_BUILD_TESTS)
+    find_package(gtest REQUIRED)
+    add_executable(sled_tests "")
+endif(SLED_BUILD_TESTS)
diff --git a/include/sled/any.h b/include/sled/any.h
index a282cef..1eabe1d 100644
--- a/include/sled/any.h
+++ b/include/sled/any.h
@@ -21,8 +21,9 @@
  * (See accompanying file LICENSE.md or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
 
-#ifndef ANY_H
-#define ANY_H
+#pragma once
+#ifndef SLED_ANY_H
+#define SLED_ANY_H
 
 #include <algorithm>
 #include <memory>
@@ -333,4 +334,4 @@ any_cast(any &&operand)
 
 }// namespace sled
 
-#endif /* ANY_H */
+#endif /* SLED_ANY_H */
diff --git a/include/sled/buffer.h b/include/sled/buffer.h
index 9ee80ca..ee03a1a 100644
--- a/include/sled/buffer.h
+++ b/include/sled/buffer.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef BUFFER_H
-#define BUFFER_H
+#pragma once
+#ifndef SLED_BUFFER_H
+#define SLED_BUFFER_H
 #include <cstring>
 #include <memory>
 #include <stdint.h>
@@ -275,4 +276,4 @@ using ZeroOnFreeBuffer = BufferT<T, true>;
 
 }// namespace sled
 
-#endif// BUFFER_H
+#endif// SLED_BUFFER_H
diff --git a/include/sled/byte_order.h b/include/sled/byte_order.h
index c8b4299..943db08 100644
--- a/include/sled/byte_order.h
+++ b/include/sled/byte_order.h
@@ -1,3 +1,6 @@
+#progam once
+#ifndef SLED_BYTE_ORDER_H
+#define SLED_BYTE_ORDER_H
 #include <arpa/inet.h>
 
 #if defined(__APPLE__)
@@ -48,3 +51,5 @@ NetworkToHost32(uint32_t n)
 {
     return be32toh(n);
 }
+
+#endif // SLED_BYTE_ORDER_H
diff --git a/include/sled/cleanup.h b/include/sled/cleanup.h
index cf225b6..14a9ee2 100644
--- a/include/sled/cleanup.h
+++ b/include/sled/cleanup.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef CLEANUP_H
-#define CLEANUP_H
+#pragma once
+#ifndef SLED_CLEANUP_H
+#define SLED_CLEANUP_H
 
 #include "sled/optional.h"
 
@@ -64,4 +65,4 @@ MakeCleanup(Callback callback)
 
 }// namespace sled
 
-#endif// CLEANUP_H
+#endif// SLED_CLEANUP_H
diff --git a/include/sled/log/log.h b/include/sled/log/log.h
index 390b15b..db04b23 100644
--- a/include/sled/log/log.h
+++ b/include/sled/log/log.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef LOG_H
-#define LOG_H
+#pragma once
+#ifndef SLED_LOG_LOG_H
+#define SLED_LOG_LOG_H
 #include "sled/system/location.h"
 #include <fmt/format.h>
 
@@ -98,4 +99,4 @@ void Log(LogLevel level,
 
 #define ASSERT(cond, fmt, ...) SLOG_ASSERT(cond, "ASSERT", fmt, ##__VA_ARGS__)
 
-#endif// LOG_H
+#endif// SLED_LOG_LOG_H
diff --git a/include/sled/make_ref_counted.h b/include/sled/make_ref_counted.h
index e64158a..35a0540 100644
--- a/include/sled/make_ref_counted.h
+++ b/include/sled/make_ref_counted.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef MAKE_REF_COUNTED_H
-#define MAKE_REF_COUNTED_H
+#pragma once
+#ifndef SLED_MAKE_REF_COUNTED_H
+#define SLED_MAKE_REF_COUNTED_H
 
 #include "sled/ref_count.h"
 #include "sled/ref_counted_object.h"
@@ -73,4 +74,4 @@ make_ref_counted(Args &&...args)
 
 }// namespace sled
 
-#endif// MAKE_REF_COUNTED_H
+#endif// SLED_MAKE_REF_COUNTED_H
diff --git a/include/sled/network/async_resolver.h b/include/sled/network/async_resolver.h
index 07c473c..f397c23 100644
--- a/include/sled/network/async_resolver.h
+++ b/include/sled/network/async_resolver.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef ASYNC_RESOLVER_H
-#define ASYNC_RESOLVER_H
+#pragma once
+#ifndef SLED_NETWORK_ASYNC_RESOLVER_H
+#define SLED_NETWORK_ASYNC_RESOLVER_H
 
 #include "sled/network/async_resolver_interface.h"
 #include "sled/scoped_refptr.h"
@@ -41,4 +42,4 @@ private:
 
 }// namespace sled
 
-#endif// ASYNC_RESOLVER_H
+#endif// SLED_NETWORK_ASYNC_RESOLVER_H
diff --git a/include/sled/network/async_resolver_interface.h b/include/sled/network/async_resolver_interface.h
index 81b79cf..1495f0b 100644
--- a/include/sled/network/async_resolver_interface.h
+++ b/include/sled/network/async_resolver_interface.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef ASYNC_RESOLVER_INTERFACE_H
-#define ASYNC_RESOLVER_INTERFACE_H
+#pragma once
+#ifndef SLED_NETWORK_ASYNC_RESOLVER_INTERFACE_H
+#define SLED_NETWORK_ASYNC_RESOLVER_INTERFACE_H
 
 #include "sled/network/socket_address.h"
 #include "sled/sigslot.h"
@@ -35,4 +36,4 @@ public:
 
 }// namespace sled
 
-#endif// ASYNC_RESOLVER_INTERFACE_H
+#endif// SLED_NETWORK_ASYNC_RESOLVER_INTERFACE_H
diff --git a/include/sled/network/ip_address.h b/include/sled/network/ip_address.h
index a2269c6..3f0673a 100644
--- a/include/sled/network/ip_address.h
+++ b/include/sled/network/ip_address.h
@@ -4,8 +4,10 @@
  * @license  : MIT
  **/
 
-#ifndef IP_ADDRESS_H
-#define IP_ADDRESS_H
+#pragma once
+
+#ifndef SLED_NETWORK_IP_ADDRESS_H
+#define SLED_NETWORK_IP_ADDRESS_H
 
 #include "sled/byte_order.h"
 #include <arpa/inet.h>
@@ -95,4 +97,4 @@ bool IPIsUnspec(const IPAddress &ip);
 
 }// namespace sled
 
-#endif// IP_ADDRESS_H
+#endif// SLED_NETWORK_IP_ADDRESS_H
diff --git a/include/sled/network/null_socket_server.h b/include/sled/network/null_socket_server.h
index c6e5334..b53d6b8 100644
--- a/include/sled/network/null_socket_server.h
+++ b/include/sled/network/null_socket_server.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef NULL_SOCKET_SERVER_H
-#define NULL_SOCKET_SERVER_H
+#pragma once
+#ifndef SLED_NETWORK_NULL_SOCKET_SERVER_H
+#define SLED_NETWORK_NULL_SOCKET_SERVER_H
 
 #include "sled/network/socket_server.h"
 #include "sled/synchronization/event.h"
@@ -26,4 +27,4 @@ private:
 
 }// namespace sled
 
-#endif// NULL_SOCKET_SERVER_H
+#endif// SLED_NETWORK_NULL_SOCKET_SERVER_H
diff --git a/include/sled/network/physical_socket_server.h b/include/sled/network/physical_socket_server.h
index c87eca2..248534a 100644
--- a/include/sled/network/physical_socket_server.h
+++ b/include/sled/network/physical_socket_server.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef PHYSICAL_SOCKET_SERVER_H
-#define PHYSICAL_SOCKET_SERVER_H
+#pragma once
+#ifndef SLED_NETWORK_PHYSICAL_SOCKET_SERVER_H
+#define SLED_NETWORK_PHYSICAL_SOCKET_SERVER_H
 
 #include "sled/network/async_resolver.h"
 #include "sled/sigslot.h"
@@ -163,4 +164,4 @@ public:
 
 }// namespace sled
 
-#endif// PHYSICAL_SOCKET_SERVER_H
+#endif// SLED_NETWORK_PHYSICAL_SOCKET_SERVER_H
diff --git a/include/sled/network/socket.h b/include/sled/network/socket.h
index 4e04420..f0cfb1b 100644
--- a/include/sled/network/socket.h
+++ b/include/sled/network/socket.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SOCKET_H
-#define SOCKET_H
+#pragma once
+#ifndef SLED_NETWORK_SOCKET_H
+#define SLED_NETWORK_SOCKET_H
 
 #include "sled/network/socket_address.h"
 #include "sled/sigslot.h"
@@ -75,4 +76,4 @@ protected:
 
 }// namespace sled
 
-#endif// SOCKET_H
+#endif// SLED_NETWORK_SOCKET_H
diff --git a/include/sled/network/socket_address.h b/include/sled/network/socket_address.h
index 219d4d9..73af897 100644
--- a/include/sled/network/socket_address.h
+++ b/include/sled/network/socket_address.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SOCKET_ADDRESS_H
-#define SOCKET_ADDRESS_H
+#pragma once
+#ifndef SLED_NETWORK_SOCKET_ADDRESS_H
+#define SLED_NETWORK_SOCKET_ADDRESS_H
 
 #include "sled/network/ip_address.h"
 
@@ -68,4 +69,4 @@ bool SocketAddressFromSockAddrStorage(const sockaddr_storage &saddr,
                                       SocketAddress *out);
 }// namespace sled
 
-#endif// SOCKET_ADDRESS_H
+#endif// SLED_NETWORK_SOCKET_ADDRESS_H
diff --git a/include/sled/network/socket_factory.h b/include/sled/network/socket_factory.h
index bfbf44d..a4a0f37 100644
--- a/include/sled/network/socket_factory.h
+++ b/include/sled/network/socket_factory.h
@@ -4,8 +4,10 @@
  * @license  : MIT
  **/
 
-#ifndef SOCKET_FACTORY_H
-#define SOCKET_FACTORY_H
+#pragma once 
+
+#ifndef SLED_NETWORK_SOCKET_FACTORY_H
+#define SLED_NETWORK_SOCKET_FACTORY_H
 
 #include "sled/network/socket.h"
 
@@ -19,4 +21,4 @@ public:
 
 }// namespace sled
 
-#endif// SOCKET_FACTORY_H
+#endif// SLED_NETWORK_SOCKET_FACTORY_H
diff --git a/include/sled/network/socket_server.h b/include/sled/network/socket_server.h
index 42f2530..c79c4fc 100644
--- a/include/sled/network/socket_server.h
+++ b/include/sled/network/socket_server.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SOCKET_SERVER_H
-#define SOCKET_SERVER_H
+#pragma 
+#ifndef SLED_NETWORK_SOCKET_SERVER_H
+#define SLED_NETWORK_SOCKET_SERVER_H
 
 #include "sled/network/socket_factory.h"
 #include "sled/units/time_delta.h"
@@ -30,4 +31,4 @@ std::unique_ptr<sled::SocketServer> CreateDefaultSocketServer();
 
 }// namespace sled
 
-#endif// SOCKET_SERVER_H
+#endif// SLED_NETWORK_SOCKET_SERVER_H
diff --git a/include/sled/numerics/divide_round.h b/include/sled/numerics/divide_round.h
index 7c36c42..dade8b9 100644
--- a/include/sled/numerics/divide_round.h
+++ b/include/sled/numerics/divide_round.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef DIVIDE_ROUND_H
-#define DIVIDE_ROUND_H
+#pragma once
+#ifndef SLED_NUMERICS_DIVIDE_ROUND_H
+#define SLED_NUMERICS_DIVIDE_ROUND_H
 
 #include <type_traits>
 
@@ -43,4 +44,4 @@ DivideRoundToNearst(Dividend dividend, Divisor divisor) -> decltype(Dividend() /
 
 }// namespace sled
 
-#endif// DIVIDE_ROUND_H
+#endif// SLED_NUMERICS_DIVIDE_ROUND_H
diff --git a/include/sled/numerics/fixed_point_number.h b/include/sled/numerics/fixed_point_number.h
index fdc3238..f4c5a14 100644
--- a/include/sled/numerics/fixed_point_number.h
+++ b/include/sled/numerics/fixed_point_number.h
@@ -21,6 +21,8 @@ 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.
 */
+
+#pragma once
 #ifndef FIXED_POINT_H_
 #define FIXED_POINT_H_
 #include <Eigen/Eigen>
diff --git a/include/sled/operations_chain.h b/include/sled/operations_chain.h
index f72c729..3f210cb 100644
--- a/include/sled/operations_chain.h
+++ b/include/sled/operations_chain.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef OPERATIONS_CHAIN_H
-#define OPERATIONS_CHAIN_H
+#pragma once
+#ifndef SLED_OPERATIONS_CHAIN_H
+#define SLED_OPERATIONS_CHAIN_H
 
 #include "sled/optional.h"
 #include "sled/ref_counted_base.h"
@@ -94,4 +95,4 @@ private:
 
 }// namespace sled
 
-#endif// OPERATIONS_CHAIN_H
+#endif// SLED_OPERATIONS_CHAIN_H
diff --git a/include/sled/optional.h b/include/sled/optional.h
index 0354ce7..0066508 100644
--- a/include/sled/optional.h
+++ b/include/sled/optional.h
@@ -14,8 +14,9 @@
 // <http://creativecommons.org/publicdomain/zero/1.0/>.
 ///
 
-#ifndef TL_OPTIONAL_HPP
-#define TL_OPTIONAL_HPP
+#pragma once
+#ifndef SLED_TL_OPTIONAL_HPP
+#define SLED_TL_OPTIONAL_HPP
 
 #define TL_OPTIONAL_VERSION_MAJOR 1
 #define TL_OPTIONAL_VERSION_MINOR 1
@@ -2496,4 +2497,4 @@ struct hash<tl::optional<T>> {
 };
 }// namespace std
 
-#endif
+#endif // SLED_TL_OPTIONAL_HPP
diff --git a/include/sled/queue/circle_queue.h b/include/sled/queue/circle_queue.h
index 11eafd8..daed31b 100644
--- a/include/sled/queue/circle_queue.h
+++ b/include/sled/queue/circle_queue.h
@@ -4,8 +4,8 @@
  * @license  : MIT
  **/
 
-#ifndef CIRCLE_QUEUE_H
-#define CIRCLE_QUEUE_H
+#ifndef SLED_QUEUE_CIRCLE_QUEUE_H
+#define SLED_QUEUE_CIRCLE_QUEUE_H
 
 #include "sled/log/log.h"
 #include <array>
@@ -66,4 +66,4 @@ private:
 
 }// namespace sled
 
-#endif// CIRCLE_QUEUE_H
+#endif// SLED_QUEUE_CIRCLE_QUEUE_H
diff --git a/include/sled/random.h b/include/sled/random.h
index 36482f9..b667aaa 100644
--- a/include/sled/random.h
+++ b/include/sled/random.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef RANDOM_H
-#define RANDOM_H
+#pragma once
+#ifndef SLED_RANDOM_H
+#define SLED_RANDOM_H
 
 #include <limits>
 #include <stdint.h>
@@ -56,4 +57,4 @@ bool Random::Rand<bool>() const;
 
 }// namespace sled
 
-#endif// RANDOM_H
+#endif// SLED_RANDOM_H
diff --git a/include/sled/ref_count.h b/include/sled/ref_count.h
index 4a49f0a..0cc1ef3 100644
--- a/include/sled/ref_count.h
+++ b/include/sled/ref_count.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef REF_COUNT_H
-#define REF_COUNT_H
+#pragma once
+#ifndef SLED_REF_COUNT_H
+#define SLED_REF_COUNT_H
 
 namespace sled {
 
@@ -22,4 +23,4 @@ protected:
 
 }// namespace sled
 
-#endif// REF_COUNT_H
+#endif// SLED_REF_COUNT_H
diff --git a/include/sled/ref_counted_base.h b/include/sled/ref_counted_base.h
index eb618a5..3b6492d 100644
--- a/include/sled/ref_counted_base.h
+++ b/include/sled/ref_counted_base.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef REF_COUNTED_BASE_H
-#define REF_COUNTED_BASE_H
+#pragma once
+#ifndef SLED_REF_COUNTED_BASE_H
+#define SLED_REF_COUNTED_BASE_H
 
 #include "sled/ref_count.h"
 #include "sled/ref_counter.h"
@@ -68,4 +69,4 @@ private:
 
 }// namespace sled
 
-#endif// REF_COUNTED_BASE_H
+#endif// SLED_REF_COUNTED_BASE_H
diff --git a/include/sled/ref_counted_object.h b/include/sled/ref_counted_object.h
index 891808f..a93e8cf 100644
--- a/include/sled/ref_counted_object.h
+++ b/include/sled/ref_counted_object.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef REF_COUNTED_OBJECT_H
-#define REF_COUNTED_OBJECT_H
+#pragma once
+#ifndef SLED_REF_COUNTED_OBJECT_H
+#define SLED_REF_COUNTED_OBJECT_H
 
 #include "sled/ref_count.h"
 #include "sled/ref_counter.h"
diff --git a/include/sled/ref_counter.h b/include/sled/ref_counter.h
index f47bf06..28daaf2 100644
--- a/include/sled/ref_counter.h
+++ b/include/sled/ref_counter.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef REF_COUNTER_H
-#define REF_COUNTER_H
+#pragma once
+#ifndef SLED_REF_COUNTER_H
+#define SLED_REF_COUNTER_H
 
 #include "sled/ref_count.h"
 #include <atomic>
@@ -42,4 +43,4 @@ private:
 }// namespace sled_impl
 }// namespace sled
 
-#endif// REF_COUNTER_H
+#endif// SLED_REF_COUNTER_H
diff --git a/include/sled/reflect/reflect.h b/include/sled/reflect/reflect.h
index b11f23e..014e348 100644
--- a/include/sled/reflect/reflect.h
+++ b/include/sled/reflect/reflect.h
@@ -4,6 +4,7 @@
  * @license  : MIT
  **/
 
+#pragma
 #ifndef SLED_REFLECT_REFLECT_H
 #define SLED_REFLECT_REFLECT_H
 
@@ -12,7 +13,7 @@
 #endif
 
 #if defined(__META_PARSER__)
-#define REFLECT_CLASS __attribute__((annotate("reflect-class")))
+#define CLASS(...) class __attribute__((annotate("reflect-class"))) #__VA_ARGS__
 #define PROPERTY() __attribute__((annotate("reflect-property")))
 #define METHOD() __attribute__((annotate("reflect-method")))
 #else
diff --git a/include/sled/scoped_refptr.h b/include/sled/scoped_refptr.h
index 7d2f731..a6bbb9d 100644
--- a/include/sled/scoped_refptr.h
+++ b/include/sled/scoped_refptr.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SCOPED_REFPTR_H
-#define SCOPED_REFPTR_H
+#pragma once
+#ifndef SLED_SCOPED_REFPTR_H
+#define SLED_SCOPED_REFPTR_H
 
 #include <memory>
 
@@ -187,4 +188,4 @@ operator<(const scoped_refptr<T> &lhs, const scoped_refptr<U> &rhs)
 
 }// namespace sled
 
-#endif// SCOPED_REFPTR_H
+#endif// SLED_SCOPED_REFPTR_H
diff --git a/include/sled/sequence_checker.h b/include/sled/sequence_checker.h
index 3961a36..d151f11 100644
--- a/include/sled/sequence_checker.h
+++ b/include/sled/sequence_checker.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SEQUENCE_CHECKER_H
-#define SEQUENCE_CHECKER_H
+#pragma once
+#ifndef SLED_SEQUENCE_CHECKER_H
+#define SLED_SEQUENCE_CHECKER_H
 
 namespace sled {
 
@@ -21,4 +22,4 @@ public:
 
 }// namespace sled
 
-#endif// SEQUENCE_CHECKER_H
+#endif// SLED_SEQUENCE_CHECKER_H
diff --git a/include/sled/sigslot.h b/include/sled/sigslot.h
index af6b390..6efb1d2 100644
--- a/include/sled/sigslot.h
+++ b/include/sled/sigslot.h
@@ -94,8 +94,9 @@
 // If signalx is single threaded the user must ensure that disconnect, connect
 // or signal is not happening concurrently or data race may occur.
 
-#ifndef RTC_BASE_THIRD_PARTY_SIGSLOT_SIGSLOT_H_
-#define RTC_BASE_THIRD_PARTY_SIGSLOT_SIGSLOT_H_
+#pragma once
+#ifndef SLED_SIGSLOT_H
+#define SLED_SIGSLOT_H
 
 #include <cstring>
 #include <list>
@@ -686,4 +687,4 @@ using signal8 =
 
 }// namespace sigslot
 
-#endif /* RTC_BASE_THIRD_PARTY_SIGSLOT_SIGSLOT_H_ */
+#endif // SLED_SIGSLOT_H
diff --git a/include/sled/status.h b/include/sled/status.h
index c9b5ce6..9b62687 100644
--- a/include/sled/status.h
+++ b/include/sled/status.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef STATUS_H
-#define STATUS_H
+#pragma once
+#ifndef SLED_STATUS_H
+#define SLED_STATUS_H
 
 #include <memory>
 #include <string>
@@ -108,4 +109,4 @@ std::ostream &operator<<(std::ostream &os, Status const &status);
 
 }// namespace sled
 
-#endif// STATUS_H
+#endif// SLED_STATUS_H
diff --git a/include/sled/status_or.h b/include/sled/status_or.h
index 6fe1d00..3356431 100644
--- a/include/sled/status_or.h
+++ b/include/sled/status_or.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef STATUS_OR_H
-#define STATUS_OR_H
+#pragma once
+#ifndef SLED_STATUS_OR_H
+#define SLED_STATUS_OR_H
 #include "sled/optional.h"
 #include "sled/status.h"
 #include <stdexcept>
@@ -161,4 +162,4 @@ make_status_or(StatusCode code, std::string message = "", ErrorInfo info = {})
 
 }// namespace sled
 
-#endif// STATUS_OR_H
+#endif// SLED_STATUS_OR_H
diff --git a/include/sled/strings/base64.h b/include/sled/strings/base64.h
index 9f9d504..e37f2b8 100644
--- a/include/sled/strings/base64.h
+++ b/include/sled/strings/base64.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef BASE64_H
-#define BASE64_H
+#pragma once
+#ifndef SLED_STRINGS_BASE64_H
+#define SLED_STRINGS_BASE64_H
 
 #include "sled/status_or.h"
 #include <string>
@@ -20,4 +21,4 @@ public:
 
 }// namespace sled
 
-#endif// BASE64_H
+#endif// SLED_STRINGS_BASE64_H
diff --git a/include/sled/strings/utils.h b/include/sled/strings/utils.h
new file mode 100644
index 0000000..a1dddda
--- /dev/null
+++ b/include/sled/strings/utils.h
@@ -0,0 +1,10 @@
+#ifndef SLED_STRINGS_UTILS_H
+#define SLED_STRINGS_UTILS_H
+namespace sled {
+
+std::string ToLower(const std::string &str);
+std::string ToUpper(const std::string &str);
+std::string ToHex(const std::string &str);
+
+} // namespace sled
+#endif //   SLED_STRINGS_UTILS_H
diff --git a/include/sled/synchronization/event.h b/include/sled/synchronization/event.h
index 4608008..1b4c4bc 100644
--- a/include/sled/synchronization/event.h
+++ b/include/sled/synchronization/event.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef EVENT_H
-#define EVENT_H
+#pragma once
+#ifndef SLED_SYNCHRONIZATION_EVENT_H
+#define SLED_SYNCHRONIZATION_EVENT_H
 
 #include "sled/synchronization/mutex.h"
 #include "sled/units/time_delta.h"
@@ -40,4 +41,4 @@ public:
 
 }// namespace sled
 
-#endif// EVENT_H
+#endif// SLED_SYNCHRONIZATION_EVENT_H
diff --git a/include/sled/synchronization/mutex.h b/include/sled/synchronization/mutex.h
index 95a5766..daf62e7 100644
--- a/include/sled/synchronization/mutex.h
+++ b/include/sled/synchronization/mutex.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef MUTEX_H
-#define MUTEX_H
+#pragma once
+#ifndef SLED_SYNCHRONIZATION_MUTEX_H
+#define SLED_SYNCHRONIZATION_MUTEX_H
 
 #include "sled/units/time_delta.h"
 #include <chrono>
@@ -159,4 +160,4 @@ private:
 
 }// namespace sled
 
-#endif// MUTEX_H
+#endif// SLED_SYNCHRONIZATION_MUTEX_H
diff --git a/include/sled/synchronization/one_time_event.h b/include/sled/synchronization/one_time_event.h
index 25e744e..4bd31e9 100644
--- a/include/sled/synchronization/one_time_event.h
+++ b/include/sled/synchronization/one_time_event.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef ONE_TIME_EVENT_H
-#define ONE_TIME_EVENT_H
+#pragma once
+#ifndef SLED_SYNCHRONIZATION_ONE_TIME_EVENT_H
+#define SLED_SYNCHRONIZATION_ONE_TIME_EVENT_H
 
 #include "sled/synchronization/mutex.h"
 
@@ -44,4 +45,4 @@ private:
 };
 }// namespace sled
 
-#endif// ONE_TIME_EVENT_H
+#endif// SLED_SYNCHRONIZATION_ONE_TIME_EVENT_H
diff --git a/include/sled/synchronization/sequence_checker_internal.h b/include/sled/synchronization/sequence_checker_internal.h
index 9b94594..a5c55af 100644
--- a/include/sled/synchronization/sequence_checker_internal.h
+++ b/include/sled/synchronization/sequence_checker_internal.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SEQUENCE_CHECKER_INTERNAL_H
-#define SEQUENCE_CHECKER_INTERNAL_H
+#pragma once
+#ifndef SLED_SYNCHRONIZATION_SEQUENCE_CHECKER_INTERNAL_H
+#define SLED_SYNCHRONIZATION_SEQUENCE_CHECKER_INTERNAL_H
 
 #include "sled/synchronization/mutex.h"
 #include <string>
@@ -53,4 +54,4 @@ ExpectationToString(const ThreadLikeObject *checker)
 
 }// namespace sled
 
-#endif// SEQUENCE_CHECKER_INTERNAL_H
+#endif// SLED_SYNCHRONIZATION_SEQUENCE_CHECKER_INTERNAL_H
diff --git a/include/sled/synchronization/thread_local.h b/include/sled/synchronization/thread_local.h
index fbd9356..fd0a66b 100644
--- a/include/sled/synchronization/thread_local.h
+++ b/include/sled/synchronization/thread_local.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef THREAD_LOCAL_H
-#define THREAD_LOCAL_H
+#pragma once
+#ifndef SLED_SYNCHRONIZATION_THREAD_LOCAL_H
+#define SLED_SYNCHRONIZATION_THREAD_LOCAL_H
 #include <cstddef>
 #include <thread>
 #include <type_traits>
@@ -92,4 +93,4 @@ private:
 
 }// namespace sled
 
-#endif// THREAD_LOCAL_H
+#endif// SLED_SYNCHRONIZATION_THREAD_LOCAL_H
diff --git a/include/sled/system/location.h b/include/sled/system/location.h
index ca2360c..86c494e 100644
--- a/include/sled/system/location.h
+++ b/include/sled/system/location.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef LOCATION_H
-#define LOCATION_H
+#pragma once
+#ifndef SLED_SYSTEM_LOCATION_H
+#define SLED_SYSTEM_LOCATION_H
 
 #include <string>
 
@@ -33,4 +34,4 @@ private:
 
 #define SLED_FROM_HERE sled::Location::Current();
 
-#endif// LOCATION_H
+#endif// SLED_SYSTEM_LOCATION_H
diff --git a/include/sled/system/thread.h b/include/sled/system/thread.h
index 7484135..1466893 100644
--- a/include/sled/system/thread.h
+++ b/include/sled/system/thread.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef THREAD_H
-#define THREAD_H
+#pragma once
+#ifndef SLED_SYSTEM_THREAD_H
+#define SLED_SYSTEM_THREAD_H
 #include "sled/synchronization/mutex.h"
 #include "sled/synchronization/thread_local.h"
 #include "sled/task_queue/task_queue_base.h"
@@ -188,4 +189,4 @@ private:
 
 }// namespace sled
 
-#endif// THREAD_H
+#endif// SLED_SYSTEM_THREAD_H
diff --git a/include/sled/system_time.h b/include/sled/system_time.h
index a0bcdb1..688fff5 100644
--- a/include/sled/system_time.h
+++ b/include/sled/system_time.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef SYSTEM_TIME_H
-#define SYSTEM_TIME_H
+#pragma once
+#ifndef SLED_SYSTEM_TIME_H
+#define SLED_SYSTEM_TIME_H
 #include <cstdint>
 
 namespace sled {
@@ -14,4 +15,4 @@ int64_t SystemTimeNanos();
 
 }// namespace sled
 
-#endif// SYSTEM_TIME_H
+#endif// SLED_SYSTEM_TIME_H
diff --git a/include/sled/task_queue/pending_task_safety_flag.h b/include/sled/task_queue/pending_task_safety_flag.h
index 781e183..799dd44 100644
--- a/include/sled/task_queue/pending_task_safety_flag.h
+++ b/include/sled/task_queue/pending_task_safety_flag.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef PENDING_TASK_SAFETY_FLAG_H
-#define PENDING_TASK_SAFETY_FLAG_H
+#pragma once
+#ifndef SLED_TASK_QUEUE_PENDING_TASK_SAFETY_FLAG_H
+#define SLED_TASK_QUEUE_PENDING_TASK_SAFETY_FLAG_H
 
 #include "sled/ref_counted_base.h"
 #include "sled/scoped_refptr.h"
@@ -35,4 +36,4 @@ private:
 
 }// namespace sled
 
-#endif// PENDING_TASK_SAFETY_FLAG_H
+#endif// SLED_TASK_QUEUE_PENDING_TASK_SAFETY_FLAG_H
diff --git a/include/sled/task_queue/task_queue_base.h b/include/sled/task_queue/task_queue_base.h
index 75544dd..7036a50 100644
--- a/include/sled/task_queue/task_queue_base.h
+++ b/include/sled/task_queue/task_queue_base.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef TASK_QUEUE_BASE_H
-#define TASK_QUEUE_BASE_H
+#pragma once
+#ifndef SLED_TASK_QUEUE_TASK_QUEUE_BASE_H
+#define SLED_TASK_QUEUE_TASK_QUEUE_BASE_H
 
 #include "sled/system/location.h"
 #include "sled/units/time_delta.h"
@@ -91,4 +92,4 @@ protected:
 
 }// namespace sled
 
-#endif// TASK_QUEUE_BASE_H
+#endif// SLED_TASK_QUEUE_TASK_QUEUE_BASE_H
diff --git a/include/sled/time_utils.h b/include/sled/time_utils.h
index 4378291..e469df1 100644
--- a/include/sled/time_utils.h
+++ b/include/sled/time_utils.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef TIME_UNITS_H
-#define TIME_UNITS_H
+#pragma once
+#ifndef SLED_TIME_UNITS_H
+#define SLED_TIME_UNITS_H
 #include <stdint.h>
 #include <time.h>
 
@@ -80,4 +81,4 @@ int64_t TimeUTCNanos();
 
 }// namespace sled
 
-#endif// TIME_UNITS_H
+#endif// SLED_TIME_UNITS_H
diff --git a/include/sled/units/time_delta.h b/include/sled/units/time_delta.h
index 287a947..8e5c775 100644
--- a/include/sled/units/time_delta.h
+++ b/include/sled/units/time_delta.h
@@ -3,9 +3,10 @@
  * @created  : Saturday Feb 03, 2024 10:31:29 CST
  * @license  : MIT
  **/
+#pragma once
 
-#ifndef TIME_DELTA_H
-#define TIME_DELTA_H
+#ifndef SLED_UNITS_TIME_DELTA_H
+#define SLED_UNITS_TIME_DELTA_H
 
 #include "sled/units/unit_base.h"
 #include <string>
@@ -104,4 +105,4 @@ operator<<(std::ostream &stream, TimeDelta value)
 
 }// namespace sled
 
-#endif// TIME_DELTA_H
+#endif// SLED_UNITS_TIME_DELTA_H
diff --git a/include/sled/units/timestamp.h b/include/sled/units/timestamp.h
index fba4906..923da4a 100644
--- a/include/sled/units/timestamp.h
+++ b/include/sled/units/timestamp.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef TIMESTAMP_H
-#define TIMESTAMP_H
+#progma once
+#ifndef SLED_UNITS_TIMESTAMP_H
+#define SLED_UNITS_TIMESTAMP_H
 #include "sled/units/time_delta.h"
 #include "sled/units/unit_base.h"
 
@@ -147,4 +148,4 @@ operator<<(std::ostream &stream, Timestamp value)
 
 }// namespace sled
 
-#endif// TIMESTAMP_H
+#endif// SLED_UNITS_TIMESTAMP_H
diff --git a/include/sled/units/unit_base.h b/include/sled/units/unit_base.h
index 9588e5c..affc33a 100644
--- a/include/sled/units/unit_base.h
+++ b/include/sled/units/unit_base.h
@@ -4,8 +4,9 @@
  * @license  : MIT
  **/
 
-#ifndef UNIT_BASE_H
-#define UNIT_BASE_H
+#pragma once
+#ifndef SLED_UNITS_UNIT_BASE_H
+#define SLED_UNITS_UNIT_BASE_H
 
 #include "sled/numerics/divide_round.h"
 #include <algorithm>
@@ -311,4 +312,4 @@ operator-(RelativeUnit<Unit_T> other)
 
 }// namespace sled
 
-#endif// UNIT_BASE_H
+#endif// SLED_UNITS_UNIT_BASE_H
diff --git a/include/sled/variant.h b/include/sled/variant.h
index 9303b8b..bed846d 100644
--- a/include/sled/variant.h
+++ b/include/sled/variant.h
@@ -5,8 +5,9 @@
 // Distributed under the Boost Software License, Version 1.0.
 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
 
-#ifndef MPARK_VARIANT_HPP
-#define MPARK_VARIANT_HPP
+#pragma once
+#ifndef SLED_MPARK_VARIANT_HPP
+#define SLED_MPARK_VARIANT_HPP
 
 /*
    variant synopsis
@@ -3038,4 +3039,4 @@ using namespace mpark;
 
 }// namespace sled
 
-#endif// MPARK_VARIANT_HPP
+#endif// SLED_MPARK_VARIANT_HPP