src: replace NULL with nullptr

Now that we are building with C++11 features enabled, replace use
of NULL with nullptr.

The benefit of using nullptr is that it can never be confused for
an integral type because it does not support implicit conversions
to integral types except boolean - unlike NULL, which is defined
as a literal `0`.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/node_crypto_bio.h b/src/node_crypto_bio.h
index 1f5657fbf1..bac79bab0b 100644
--- a/src/node_crypto_bio.h
+++ b/src/node_crypto_bio.h
@@ -32,8 +32,8 @@ class NodeBIO {
  public:
   NodeBIO() : initial_(kInitialBufferLength),
               length_(0),
-              read_head_(NULL),
-              write_head_(NULL) {
+              read_head_(nullptr),
+              write_head_(nullptr) {
   }
 
   ~NodeBIO();
@@ -89,7 +89,7 @@ class NodeBIO {
   }
 
   static inline NodeBIO* FromBIO(BIO* bio) {
-    CHECK_NE(bio->ptr, NULL);
+    CHECK_NE(bio->ptr, nullptr);
     return static_cast<NodeBIO*>(bio->ptr);
   }
 
@@ -113,7 +113,7 @@ class NodeBIO {
     explicit Buffer(size_t len) : read_pos_(0),
                                   write_pos_(0),
                                   len_(len),
-                                  next_(NULL) {
+                                  next_(nullptr) {
       data_ = new char[len];
     }