Add iterators for Byte/WideStringCs.

Change-Id: I40ec07c0da54bcf36c83fa26ff457cd4b98a91cf
Reviewed-on: https://pdfium-review.googlesource.com/4261
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/core/fxcrt/cfx_string_c_template.h b/core/fxcrt/cfx_string_c_template.h
index 4aba2cd4b9..75c2be0efc 100644
--- a/core/fxcrt/cfx_string_c_template.h
+++ b/core/fxcrt/cfx_string_c_template.h
@@ -22,6 +22,7 @@ class CFX_StringCTemplate {
  public:
   using CharType = T;
   using UnsignedType = typename std::make_unsigned<CharType>::type;
+  using const_iterator = const CharType*;
 
   CFX_StringCTemplate() : m_Ptr(nullptr), m_Length(0) {}
 
@@ -73,6 +74,14 @@ class CFX_StringCTemplate {
     return *this;
   }
 
+  const_iterator begin() const {
+    return reinterpret_cast<const CharType*>(m_Ptr);
+  }
+  const_iterator end() const {
+    return m_Ptr ? reinterpret_cast<const CharType*>(m_Ptr) + m_Length
+                 : nullptr;
+  }
+
   bool operator==(const CharType* ptr) const {
     return FXSYS_len(ptr) == m_Length &&
            FXSYS_cmp(ptr, reinterpret_cast<const CharType*>(m_Ptr), m_Length) ==