Made Vector have a size() function, to make it more STL-alike.

Bug: 17316346
Change-Id: I52377b7fa51adccadc4e867d45666e683bc2c1ae
Tested: on Linux.

include/flatbuffers/flatbuffers.h

@@ -247,12 +247,15 @@ public:
   typedef VectorIterator<T, false> iterator;
   typedef VectorIterator<T, true> const_iterator;
 
-  uoffset_t Length() const { return EndianScalar(length_); }
+  uoffset_t size() const { return EndianScalar(length_); }
+
+  // Deprecated: use size(). Here for backwards compatibility.
+  uoffset_t Length() const { return size(); }
 
   typedef typename IndirectHelper<T>::return_type return_type;
 
   return_type Get(uoffset_t i) const {
-    assert(i < Length());
+    assert(i < size());
     return IndirectHelper<T>::Read(Data(), i);
   }
 
@@ -727,7 +730,7 @@ class Verifier {
   // Special case for string contents, after the above has been called.
   bool VerifyVectorOfStrings(const Vector<Offset<String>> *vec) const {
       if (vec) {
-        for (uoffset_t i = 0; i < vec->Length(); i++) {
+        for (uoffset_t i = 0; i < vec->size(); i++) {
           if (!Verify(vec->Get(i))) return false;
         }
       }
@@ -737,7 +740,7 @@ class Verifier {
   // Special case for table contents, after the above has been called.
   template<typename T> bool VerifyVectorOfTables(const Vector<Offset<T>> *vec) {
     if (vec) {
-      for (uoffset_t i = 0; i < vec->Length(); i++) {
+      for (uoffset_t i = 0; i < vec->size(); i++) {
         if (!vec->Get(i)->Verify(*this)) return false;
       }
     }

src/idl_gen_text.cpp

@@ -70,7 +70,7 @@ template<typename T> void PrintVector(const Vector<T> &v, Type type,
   std::string &text = *_text;
   text += "[";
   text += NewLine(opts);
-  for (uoffset_t i = 0; i < v.Length(); i++) {
+  for (uoffset_t i = 0; i < v.size(); i++) {
     if (i) {
       text += ",";
       text += NewLine(opts);
@@ -91,7 +91,7 @@ template<typename T> void PrintVector(const Vector<T> &v, Type type,
 static void EscapeString(const String &s, std::string *_text) {
   std::string &text = *_text;
   text += "\"";
-  for (uoffset_t i = 0; i < s.Length(); i++) {
+  for (uoffset_t i = 0; i < s.size(); i++) {
     char c = s.Get(i);
     switch (c) {
       case '\n': text += "\\n"; break;