Anywhere where we use MemoryRegion::begin to get access to the raw pointer

representation (rather than in an interator context), instead use &buf[0],
which works for both MemoryRegion and std::vector

3 files changed, 4 insertions, 4 deletions

diff --git a/src/math/bigint/big_io.cpp b/src/math/bigint/big_io.cpp
index b50fcceff..f3e7fb861 100644
--- a/src/math/bigint/big_io.cpp
+++ b/src/math/bigint/big_io.cpp
@@ -31,7 +31,7 @@ std::ostream& operator<<(std::ostream& stream, const BigInt& n)
       u32bit skip = 0;
       while(buffer[skip] == '0' && skip < buffer.size())
          ++skip;
-      stream.write(reinterpret_cast<const char*>(buffer.begin()) + skip,
+      stream.write(reinterpret_cast<const char*>(&buffer[0]) + skip,
                    buffer.size() - skip);
       }
    if(!stream.good())
diff --git a/src/math/bigint/big_ops2.cpp b/src/math/bigint/big_ops2.cpp
index 193c00e32..554fb1793 100644
--- a/src/math/bigint/big_ops2.cpp
+++ b/src/math/bigint/big_ops2.cpp
@@ -32,7 +32,7 @@ BigInt& BigInt::operator+=(const BigInt& y)
          {
          SecureVector<word> z(reg_size - 1);
          bigint_sub3(z, y.data(), reg_size - 1, data(), x_sw);
-         copy_mem(get_reg().begin(), z.begin(), z.size());
+         copy_mem(&reg[0], &z[0], z.size());
          set_sign(y.sign());
          }
       else if(relative_size == 0)
diff --git a/src/math/bigint/bigint.h b/src/math/bigint/bigint.h
index 9ce71aeca..cd6997698 100644
--- a/src/math/bigint/bigint.h
+++ b/src/math/bigint/bigint.h
@@ -291,7 +291,7 @@ class BOTAN_DLL BigInt
      */
      u32bit sig_words() const
         {
-        const word* x = reg.begin();
+        const word* x = &reg[0];
         u32bit sig = reg.size();
 
         while(sig && (x[sig-1] == 0))
@@ -316,7 +316,7 @@ class BOTAN_DLL BigInt
      * @result a pointer to the start of the internal register of
      * the integer value
      */
-     const word* data() const { return reg.begin(); }
+     const word* data() const { return &reg[0]; }
 
      /**
      * return a reference to the internal register containing the value