boost::afio::utils Namespace Reference

Utility routines often useful when using AFIO. More...

Classes
class	secded_ecc
	Calculates the single error correcting double error detecting (SECDED) Hamming Error Correcting Code for a blocksize block of bytes. For example, a secdec_ecc<8> would be the very common 72,64 Hamming code used in ECC RAM, or secdec_ecc<4096> would be for a 32784,32768 Hamming code. More...
class	page_allocator
	An STL allocator which allocates large TLB page memory.If the operating system is configured to allow it, this type of memory is particularly efficient for doing large scale file i/o. This is because the kernel must normally convert the scatter gather buffers you pass into extended scatter gather buffers as the memory you see as contiguous may not, and probably isn't, actually be contiguous in physical memory. Regions returned by this allocator may be allocated contiguously in physical memory and therefore the kernel can pass through your scatter gather buffers unmodified. More...
class	page_allocator< void >
Functions
BOOST_AFIO_DECL std::vector < size_t >	page_sizes (bool only_actually_available=true) noexcept
	Returns the page sizes of this architecture which is useful for calculating direct i/o multiples.
size_t	file_buffer_default_size () noexcept
	Returns a reasonable default size for page_allocator, typically the closest page size from page_sizes() to 1Mb.
BOOST_AFIO_DECL void	random_fill (char *buffer, size_t bytes)
	Fills the buffer supplied with cryptographically strong randomness. Uses the OS kernel API.
size_t	to_hex_string (char *out, size_t outlen, const char *_in, size_t inlen)
	Converts a number to a hex string. Out buffer can be same as in buffer.
std::string	to_hex_string (std::string in)
size_t	from_hex_string (char *out, size_t outlen, const char *in, size_t inlen)
	Converts a hex string to a number. Out buffer can be same as in buffer.
std::string	random_string (size_t randomlen)
	Returns a cryptographically random string capable of being used as a filename. Essentially random_fill() + to_hex_string().
template<class T , class U >
bool	operator== (const page_allocator< T > &, const page_allocator< U > &) noexcept

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Detailed Description

Utility routines often useful when using AFIO.

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Function Documentation

std::string boost::afio::utils::to_hex_string

(

std::string

in

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 5832 of file afio.hpp.