[Open Screen] Fix lint errors.

This fixes a number of lint errors in the codebase flagged by cpplint.py.

It also turns off a couple of checks:

1. The header check is too restrictive
2. The whitespace/braces check doesn't fully grok initializer list syntax.

Bug: b/156101497
Change-Id: I11caefdc14fa1c5891022357bee35595673c4341
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/2219135
Reviewed-by: Ryan Keane <rwkeane@google.com>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>

4 files changed, 5 insertions, 4 deletions

diff --git a/util/big_endian.cc b/util/big_endian.cc
index d5658900..59992d60 100644
--- a/util/big_endian.cc
+++ b/util/big_endian.cc
@@ -30,4 +30,4 @@ bool BigEndianWriter::Write(const void* buffer, size_t length) {
   return false;
 }
 
-}  // namespace openscreen
\ No newline at end of file
+}  // namespace openscreen
diff --git a/util/big_endian.h b/util/big_endian.h
index b2067d75..0953ddf0 100644
--- a/util/big_endian.h
+++ b/util/big_endian.h
@@ -150,7 +150,7 @@ class BigEndianBuffer {
  public:
   class Cursor {
    public:
-    Cursor(BigEndianBuffer* buffer)
+    explicit Cursor(BigEndianBuffer* buffer)
         : buffer_(buffer), origin_(buffer_->current_) {}
     Cursor(const Cursor& other) = delete;
     Cursor(Cursor&& other) = delete;
diff --git a/util/crypto/secure_hash.h b/util/crypto/secure_hash.h
index 7c007f96..f748cc45 100644
--- a/util/crypto/secure_hash.h
+++ b/util/crypto/secure_hash.h
@@ -21,7 +21,7 @@ namespace openscreen {
 // same as if we have the full input in advance.
 class SecureHash {
  public:
-  SecureHash(const EVP_MD* type);
+  explicit SecureHash(const EVP_MD* type);
   SecureHash(const SecureHash& other);
   SecureHash(SecureHash&& other);
   SecureHash& operator=(const SecureHash& other);
diff --git a/util/weak_ptr.h b/util/weak_ptr.h
index cb6967a1..c941017d 100644
--- a/util/weak_ptr.h
+++ b/util/weak_ptr.h
@@ -6,6 +6,7 @@
 #define UTIL_WEAK_PTR_H_
 
 #include <memory>
+#include <utility>
 
 #include "util/osp_logging.h"
 
@@ -92,7 +93,7 @@ class WeakPtr {
   }
 
   // Create/Assign from nullptr.
-  WeakPtr(std::nullptr_t) {}
+  WeakPtr(std::nullptr_t) {}  // NOLINT
 
   WeakPtr& operator=(std::nullptr_t) {
     impl_.reset();