fix(mac): Add initializer list constructor

Author: lucasssvaz

cores/esp32/MacAddress.cpp

@@ -32,6 +32,24 @@ MacAddress::MacAddress(const String &macstr) {
   fromString(macstr.c_str());
 }
 
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+MacAddress::MacAddress(std::initializer_list<uint8_t> list) {
+  size_t size = list.size();
+  memset(_mac.bytes, 0, sizeof(_mac.bytes));
+  if (size == 6) {
+    _type = MAC6;
+  } else if (size == 8) {
+    _type = MAC8;
+  } else {
+    // Default to MAC6 and keep the rest of the bytes as 0
+    _type = MAC6;
+    return;
+  }
+
+  memcpy(_mac.bytes, list.begin(), size);
+}
+#endif
+
 MacAddress::MacAddress(uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5, uint8_t b6) {
   _type = MAC6;
   memset(_mac.bytes, 0, sizeof(_mac.bytes));

cores/esp32/MacAddress.h

@@ -23,6 +23,9 @@
 #include <stdint.h>
 #include <WString.h>
 #include <Printable.h>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <initializer_list>
+#endif
 
 enum MACType {
   MAC6,
@@ -56,6 +59,12 @@ class MacAddress : public Printable {
   MacAddress(const char *macstr);
   MacAddress(const String &macstr);
 
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+  // Initializer list constructor for {0xAA, 0xBB, ...} syntax
+  // This has higher priority than String conversion, preventing ambiguity
+  MacAddress(std::initializer_list<uint8_t> list);
+#endif
+
   virtual ~MacAddress() {}
 
   bool fromString(const char *buf);

cores/esp32/WString.h

@@ -29,7 +29,9 @@
 #include <stdint.h>
 #include <string.h>
 #include <ctype.h>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
 #include <initializer_list>
+#endif
 
 // A pure abstract class forward used as a means to proide a unique pointer type
 // but really is never defined.