XII Release 0.1.0
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xiiDeferredFileWriter Class Reference

A file writer that caches all written data and only opens and writes to the output file when everything is finished. Useful to ensure that only complete files are written, or nothing at all, in case of a crash. More...

#include <DeferredFileWriter.h>

Inheritance diagram for xiiDeferredFileWriter:
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Public Member Functions

 ~xiiDeferredFileWriter ()
 Upon destruction the file is closed and thus written, unless Discard was called before.
 
void SetOutput (xiiStringView sFileToWriteTo, bool bOnlyWriteIfDifferent=false)
 This must be configured before anything is written to the file.
 
virtual xiiResult WriteBytes (const void *pWriteBuffer, xiiUInt64 uiBytesToWrite) override
 Writes a raw number of bytes from the buffer, this is the only method which has to be implemented to fully implement the interface.
 
xiiResult Close (bool *out_pWasWrittenTo=nullptr)
 Upon calling this the content is written to the file specified with SetOutput(). The return value is XII_FAILURE if the file could not be opened or not completely written.
 
void Discard ()
 Calling this abandons the content and a later Close or destruction of the instance will no longer write anything to file.
 
- Public Member Functions inherited from xiiStreamWriter
 xiiStreamWriter ()
 Constructor.
 
virtual ~xiiStreamWriter ()
 Virtual destructor to ensure correct cleanup.
 
virtual xiiResult Flush ()
 Flushes the stream, may be implemented (not necessary to implement the interface correctly) so that user code can ensure that content is written.
 
template<typename T>
xiiResult WriteWordValue (const T *pWordValue)
 Helper method to write a word value correctly (copes with potentially different endianess).
 
template<typename T>
xiiResult WriteDWordValue (const T *pDWordValue)
 Helper method to write a dword value correctly (copes with potentially different endianess).
 
template<typename T>
xiiResult WriteQWordValue (const T *pQWordValue)
 Helper method to write a qword value correctly (copes with potentially different endianess).
 
XII_ALWAYS_INLINE void WriteVersion (xiiTypeVersion version)
 Writes a type version to the stream.
 
template<typename ArrayType, typename ValueType>
xiiResult WriteArray (const xiiArrayBase< ValueType, ArrayType > &array)
 Writes an array of elements to the stream.
 
template<typename ValueType, xiiUInt16 uiSize>
xiiResult WriteArray (const xiiSmallArrayBase< ValueType, uiSize > &array)
 Writes a small array of elements to the stream.
 
template<typename ValueType, xiiUInt32 uiSize>
xiiResult WriteArray (const ValueType(&array)[uiSize])
 Writes a C style fixed array.
 
template<typename KeyType, typename Comparer>
xiiResult WriteSet (const xiiSetBase< KeyType, Comparer > &set)
 Writes a set.
 
template<typename KeyType, typename ValueType, typename Comparer>
xiiResult WriteMap (const xiiMapBase< KeyType, ValueType, Comparer > &map)
 Writes a map.
 
template<typename KeyType, typename ValueType, typename Hasher>
xiiResult WriteHashTable (const xiiHashTableBase< KeyType, ValueType, Hasher > &hashTable)
 Writes a hash table (note that the entry order might change on read)
 
xiiResult WriteString (const xiiStringView sStringView)
 Writes a string.
 

Detailed Description

A file writer that caches all written data and only opens and writes to the output file when everything is finished. Useful to ensure that only complete files are written, or nothing at all, in case of a crash.

Member Function Documentation

◆ WriteBytes()

xiiResult xiiDeferredFileWriter::WriteBytes ( const void * pWriteBuffer,
xiiUInt64 uiBytesToWrite )
overridevirtual

Writes a raw number of bytes from the buffer, this is the only method which has to be implemented to fully implement the interface.

Implements xiiStreamWriter.


The documentation for this class was generated from the following files: