diff --git a/CMakeLists.txt b/CMakeLists.txt
index 675e6a4..123dd25 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ project(ics3 CXX)
 
 SET(PROJECT_VER_MAJOR 1)
 SET(PROJECT_VER_MINOR 2)
-SET(PROJECT_VER_PATCH 2)
+SET(PROJECT_VER_PATCH 3)
 SET(PROJECT_VER "${PROJECT_VER_MAJOR}.${PROJECT_VER_MINOR}.${PROJECT_VER_PATCH}")
 SET(PROJECT_APIVER "${PROJECT_VER_MAJOR}.${PROJECT_VER_MINOR}")
 
diff --git a/include/ics3/eepparam.hpp b/include/ics3/eepparam.hpp
index a0dac83..95bfd89 100644
--- a/include/ics3/eepparam.hpp
+++ b/include/ics3/eepparam.hpp
@@ -12,6 +12,7 @@ namespace ics {
     using type = uint16_t;
     using size_type = std::size_t;
     using TargetContainer = std::array<uint8_t, 64>;
+    using InvalidChecker = type (&)(type, type, type);
     enum Flag : type {
       REVERSE =   0x01,
       FREE =      0x02,
@@ -54,7 +55,7 @@ namespace ics {
         size_type,
         type,
         type,
-        type (*)(type, type, type),
+        InvalidChecker,
         type);
     static constexpr type checkInvalidRange(type, type, type);
     static constexpr type checkInvalidEvenRange(type, type, type);
@@ -66,80 +67,80 @@ namespace ics {
     const size_type length;
     const type min;
     const type max;
-    type (*const setFunc)(type, type, type);
+    InvalidChecker setFunc;
     type data;
   };
 
   constexpr EepParam EepParam::stretch(type data) {
-    return {2, 2, 2, 254, &EepParam::checkInvalidEvenRange, data};
+    return {2, 2, 2, 254, EepParam::checkInvalidEvenRange, data};
   }
 
   constexpr EepParam EepParam::speed(type data) {
-    return {4, 2, 1, 127, &EepParam::checkInvalidRange, data};
+    return {4, 2, 1, 127, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::punch(type data) {
-    return {6, 2, 0, 10, &EepParam::checkInvalidRange, data};
+    return {6, 2, 0, 10, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::deadBand(type data) {
-    return {8, 2, 0, 5, &EepParam::checkInvalidRange, data};
+    return {8, 2, 0, 5, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::dumping(type data) {
-    return {10, 2, 1, 255, &EepParam::checkInvalidRange, data};
+    return {10, 2, 1, 255, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::selfTimer(type data) {
-    return {12, 2, 10, 255, &EepParam::checkInvalidRange, data};
+    return {12, 2, 10, 255, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::flag(type data) {
-    return {14, 2, 0, 255, &EepParam::checkInvalidFlag, data};
+    return {14, 2, 0, 255, EepParam::checkInvalidFlag, data};
   }
 
   constexpr EepParam EepParam::pulseMax(type data) {
-    return {16, 4, 3500, 11500, &EepParam::checkInvalidRange, data};
+    return {16, 4, 3500, 11500, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::pulseMin(type data) {
-    return {20, 4, 3500, 11500, &EepParam::checkInvalidRange, data};
+    return {20, 4, 3500, 11500, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::baudrate(type data) {
-    return {26, 2, 0, 10, &EepParam::checkInvalidBaudrate, data};
+    return {26, 2, 0, 10, EepParam::checkInvalidBaudrate, data};
   }
 
   constexpr EepParam EepParam::temperature(type data) {
-    return {28, 2, 1, 127, &EepParam::checkInvalidRange, data};
+    return {28, 2, 1, 127, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::current(type data) {
-    return {30, 2, 1, 63, &EepParam::checkInvalidRange, data};
+    return {30, 2, 1, 63, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::response(type data) {
-    return {50, 2, 1, 5, &EepParam::checkInvalidRange, data};
+    return {50, 2, 1, 5, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::userOffset(type data) {
-    return {52, 2, 0x81, 127, &EepParam::checkInvalidOffset, data}; // 0x81 is -127 on uint8_t type
+    return {52, 2, 0x81, 127, EepParam::checkInvalidOffset, data}; // 0x81 is -127 on uint8_t type
   }
 
   constexpr EepParam EepParam::id(type data) {
-    return {56, 2, 0, 31, &EepParam::checkInvalidRange, data};
+    return {56, 2, 0, 31, EepParam::checkInvalidRange, data};
   }
 
   constexpr EepParam EepParam::strech1(type data) {
-    return {58, 2, 2, 254, &EepParam::checkInvalidEvenRange, data};
+    return {58, 2, 2, 254, EepParam::checkInvalidEvenRange, data};
   }
 
   constexpr EepParam EepParam::strech2(type data) {
-    return {60, 2, 2, 254, &EepParam::checkInvalidEvenRange, data};
+    return {60, 2, 2, 254, EepParam::checkInvalidEvenRange, data};
   }
 
   constexpr EepParam EepParam::strech3(type data) {
-    return {62, 2, 2, 254, &EepParam::checkInvalidEvenRange, data};
+    return {62, 2, 2, 254, EepParam::checkInvalidEvenRange, data};
   }
 
   constexpr EepParam EepParam::newEepParam(const EepParam& paramType, type data) {
@@ -155,7 +156,7 @@ namespace ics {
   }
 
   inline void EepParam::set(type input) {
-    data = (*setFunc)(input, min, max); // throw std::invalid_argument, std::out_of_range
+    data = setFunc(input, min, max); // throw std::invalid_argument, std::out_of_range
   }
 
   inline EepParam& EepParam::operator=(type input) {
@@ -186,7 +187,7 @@ namespace ics {
       size_type length,
       type min,
       type max,
-      type (*setFunc)(type, type, type),
+      InvalidChecker setFunc,
       type data)
   : offset(offset),
     length(length),
diff --git a/src/core.cpp b/src/core.cpp
index f034707..f114a9e 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -18,7 +18,7 @@ ics::Core::Core(const std::string& path, speed_t baudrate)
       throw std::invalid_argument {"Not tty device"};
     if (tcgetattr(fd, &oldTio) < 0)
       throw std::runtime_error {"Cannot setup tty"};
-    auto newTio = getTermios();
+    auto&& newTio = getTermios(); // forward reference
     if (cfsetispeed(&newTio, baudrate) < 0)
       throw std::runtime_error {"Cannot set baudrate"};
     if (cfsetospeed(&newTio, baudrate) < 0)
@@ -66,7 +66,7 @@ void ics::Core::communicate(const Container& tx, Container& rx) {
   write(fd, tx.data(), tx.size()); // send
   for (auto& receive : rx) read(fd, &receive, 1); // receive
 // check section
-  auto receive = rx.cbegin();
+  auto&& receive = rx.cbegin();
   for (const auto& send : tx) {
     if (send != *receive) {
       std::stringstream ss;
@@ -82,7 +82,7 @@ void ics::Core::communicateID(const IDContainerTx& tx, IDContainerRx& rx) {
   write(fd, tx.data(), tx.size()); // send
   for (auto& receive : rx) read(fd, &receive, 1); // receive
 // check section
-  auto receive = rx.cbegin();
+  auto&& receive = rx.cbegin();
   for (const auto& send : tx) {
     if (send != *receive) {
       std::stringstream ss;