Fix stand alone compiling, minor code updates

include/athena/FileWriter.hpp

@@ -1,6 +1,6 @@
 #pragma once
 
-#if _WIN32
+#ifdef _WIN32
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
@@ -20,14 +20,14 @@ public:
   ~FileWriter() override;
 
   std::string filename() const {
-#if _WIN32
+#ifdef _WIN32
     return utility::wideToUtf8(m_filename);
 #else
     return m_filename;
 #endif
   }
   std::wstring wfilename() const {
-#if _WIN32
+#ifdef _WIN32
     return m_filename;
 #else
     return utility::utf8ToWide(m_filename);
@@ -36,13 +36,13 @@ public:
 
   void open(bool overwrite = true);
   void close();
-  bool isOpen() const { return m_fileHandle != 0; }
+  bool isOpen() const { return m_fileHandle != nullptr; }
   void seek(atInt64 pos, SeekOrigin origin = SeekOrigin::Current) override;
   atUint64 position() const override;
   atUint64 length() const override;
   void writeUBytes(const atUint8* data, atUint64 len) override;
 
-#if _WIN32
+#ifdef _WIN32
   using HandleType = HANDLE;
 #else
   using HandleType = FILE*;
@@ -51,7 +51,7 @@ public:
   HandleType _fileHandle() { return m_fileHandle; }
 
 private:
-#if _WIN32
+#ifdef _WIN32
   std::wstring m_filename;
 #else
   std::string m_filename;
@@ -61,7 +61,7 @@ private:
 };
 
 class TransactionalFileWriter : public IStreamWriter {
-#if _WIN32
+#ifdef _WIN32
   std::wstring m_filename;
 #else
   std::string m_filename;
@@ -73,7 +73,7 @@ class TransactionalFileWriter : public IStreamWriter {
 public:
   explicit TransactionalFileWriter(std::string_view filename, bool overwrite = true, bool globalErr = true)
   : m_overwrite(overwrite), m_globalErr(globalErr) {
-#if _WIN32
+#ifdef _WIN32
     m_filename = utility::utf8ToWide(filename);
 #else
     m_filename = filename;
@@ -81,7 +81,7 @@ public:
   }
   explicit TransactionalFileWriter(std::wstring_view filename, bool overwrite = true, bool globalErr = true)
   : m_overwrite(overwrite), m_globalErr(globalErr) {
-#if _WIN32
+#ifdef _WIN32
     m_filename = filename;
 #else
     m_filename = utility::wideToUtf8(filename);

include/athena/VectorWriter.hpp

@@ -43,7 +43,7 @@ public:
 
   /*! @brief Writes the given buffer with the specified length, buffers can be bigger than the length
    *  however it's undefined behavior to try and write a buffer which is smaller than the given length.
-   *  If you are needing to fill in an area please use IStreamWriter::fill(atUint64) instead.
+   *  If you are needing to fill in an area please use @sa IStreamWriter::fill(atUint64) instead.
    *
    * @param data The buffer to write
    * @param length The amount to write