From 3f1ab1fd8187910a505f3d3308fb235a57ee9fe8 Mon Sep 17 00:00:00 2001
From: Pauline Middelink <middelink@users.noreply.github.com>
Date: Mon, 18 Jul 2016 13:31:34 +0200
Subject: [PATCH] Updated String library to use C++11 iterators. (#2267)

This will allow using the String library in a ranged for loop:

```C++
String s("Hi, this is a test");

for (const char& ch : s) {
  Serial.print(ch);
}
```

and even modify

```C++
String s("Hi, this is another test");

for (char& ch : s) {
  ch++;
}
Serial.println(s);
```
---
 cores/esp8266/WString.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/cores/esp8266/WString.h b/cores/esp8266/WString.h
index 3f216cee4..a3bb40c13 100644
--- a/cores/esp8266/WString.h
+++ b/cores/esp8266/WString.h
@@ -207,9 +207,11 @@ class String {
         void toCharArray(char *buf, unsigned int bufsize, unsigned int index = 0) const {
             getBytes((unsigned char *) buf, bufsize, index);
         }
-        const char * c_str() const {
-            return buffer;
-        }
+        const char* c_str() const { return buffer; }
+        char* begin() { return buffer; }
+        char* end() { return buffer + length(); }
+        const char* begin() const { return c_str(); }
+        const char* end() const { return c_str() + length(); }
 
         // search
         int indexOf(char ch) const;