const-correctness IPAddress::toString()

Palatis · Palatis · commit 5666ec2ec1e0 · 2016-09-13T00:32:29.000+08:00
it doesn't modify any member variables, should be safe to be const.
diff --git a/cores/esp8266/IPAddress.cpp b/cores/esp8266/IPAddress.cpp
@@ -105,7 +105,7 @@ size_t IPAddress::printTo(Print& p) const {
     return n;
 }
 
-String IPAddress::toString()
+String IPAddress::toString() const
 {
     char szRet[16];
     sprintf(szRet,"%u.%u.%u.%u", _address.bytes[0], _address.bytes[1], _address.bytes[2], _address.bytes[3]);
diff --git a/cores/esp8266/IPAddress.h b/cores/esp8266/IPAddress.h
@@ -77,7 +77,7 @@ class IPAddress: public Printable {
         IPAddress& operator=(uint32_t address);
 
         virtual size_t printTo(Print& p) const;
-        String toString();
+        String toString() const;
 
         friend class EthernetClass;
         friend class UDP;

Original file line number	Diff line number	Diff line change
`@@ -105,7 +105,7 @@ size_t IPAddress::printTo(Print& p) const {`
`105`	`105`	`return n;`
`106`	`106`	`}`
`107`	`107`
`108`		`-String IPAddress::toString()`
	`108`	`+String IPAddress::toString() const`
`109`	`109`	`{`
`110`	`110`	`char szRet[16];`
`111`	`111`	`sprintf(szRet,"%u.%u.%u.%u", _address.bytes[0], _address.bytes[1], _address.bytes[2], _address.bytes[3]);`