namespace YYCC::IOHelper {
/**

\page io_helper IO Helper

Actually, YYCC::IOHelper includes functions which can not be placed in other place.

\section io_helper__ptr_pri_padding Pointer Print Padding

When printing pointer on screen, programmer usually left-pad zero to make it looks good.
However, the count of zero for padding is different in x86 and x64 architecture (8 for x86 and 16 for x64).
Macro \c PRI_XPTR_LEFT_PADDING will help you to resolve this issue.

Macro \c PRI_XPTR_LEFT_PADDING will be defined to following value according to the target system architecture.

\li \c "08": On x86 system.
\li \c "016": On x64 system.

There is an example for how to use it:

\code
void* raw_ptr = blabla();
std::printf(stdout, "Raw Pointer 0x%" PRI_XPTR_LEFT_PADDING PRIXPTR, raw_ptr);
\endcode

Note \c PRIXPTR is defined by standard library for formatting pointer as hexadecimal style.

\section io_helper__smart_file Smart FILE Pointer

#SmartStdFile use \c std::unique_ptr with custom deleter to implement smart \c FILE*.
It is useful in the cases that you want to automatically free opened file when leaving corresponding scope.

\section io_helper__utf8_fopen UTF8 fopen

In Windows, standard \c std::fopen can not handle UTF8 file name in common environment.
So we create this function to give programmer an universal \c fopen in UTF8 style.

In Windows platform, this function will try to convert its argument to \c wchar_t
and calling Microsoft specific \c _wfopen function to open file.
If encoding convertion or \c _wfopen failed, this function will return \c nullptr like \c std::fopen does.
In other platforms, it will simply redirect calling to \c std::fopen.

There is a simple example:

\code
FILE* fs = YYCC::IOHelper::FOpen(YYCC_U8("/path/to/file"), YYCC_U8("rb"));
\endcode

*/
}