cudf::string_view Class Reference

A non-owning, immutable view of device data that is a variable length char array representing a UTF-8 string. More...

#include <string_view.hpp>

Classes
class	const_iterator
	Handy iterator for navigating through encoded characters. More...

Public Member Functions
CUDA_HOST_DEVICE_CALLABLE size_type	size_bytes () const
	Return the number of bytes in this string.
CUDA_DEVICE_CALLABLE size_type	length () const
	Return the number of characters in this string.
CUDA_HOST_DEVICE_CALLABLE const char *	data () const
	Return a pointer to the internal device array.
CUDA_HOST_DEVICE_CALLABLE bool	empty () const
	Return true if string has no characters.
CUDA_DEVICE_CALLABLE const_iterator	begin () const
	Return new iterator pointing to the beginning of this string.
CUDA_DEVICE_CALLABLE const_iterator	end () const
	Return new iterator pointing past the end of this string.
CUDA_DEVICE_CALLABLE char_utf8	operator[] (size_type pos) const
	Return single UTF-8 character at the given character position. More...
CUDA_DEVICE_CALLABLE size_type	byte_offset (size_type pos) const
	Return the byte offset from data() for a given character position. More...
CUDA_DEVICE_CALLABLE int	compare (const string_view &str) const
	Comparing target string with this string. Each character is compared as a UTF-8 code-point value. More...
CUDA_DEVICE_CALLABLE int	compare (const char *str, size_type bytes) const
	Comparing target string with this string. Each character is compared as a UTF-8 code-point value. More...
CUDA_DEVICE_CALLABLE bool	operator== (const string_view &rhs) const
	Returns true if rhs matches this string exactly.
CUDA_DEVICE_CALLABLE bool	operator!= (const string_view &rhs) const
	Returns true if rhs does not match this string.
CUDA_DEVICE_CALLABLE bool	operator< (const string_view &rhs) const
	Returns true if this string is ordered before rhs.
CUDA_DEVICE_CALLABLE bool	operator> (const string_view &rhs) const
	Returns true if rhs is ordered before this string.
CUDA_DEVICE_CALLABLE bool	operator<= (const string_view &rhs) const
	Returns true if this string matches or is ordered before rhs.
CUDA_DEVICE_CALLABLE bool	operator>= (const string_view &rhs) const
	Returns true if rhs matches or is ordered before this string.
CUDA_DEVICE_CALLABLE size_type	find (const string_view &str, size_type pos=0, size_type count=-1) const
	Returns the character position of the first occurrence where the argument str is found in this string within the character range [pos,pos+n). More...
CUDA_DEVICE_CALLABLE size_type	find (const char *str, size_type bytes, size_type pos=0, size_type count=-1) const
	Returns the character position of the first occurrence where the array str is found in this string within the character range [pos,pos+n). More...
CUDA_DEVICE_CALLABLE size_type	find (char_utf8 character, size_type pos=0, size_type count=-1) const
	Returns the character position of the first occurrence where character is found in this string within the character range [pos,pos+n). More...
CUDA_DEVICE_CALLABLE size_type	rfind (const string_view &str, size_type pos=0, size_type count=-1) const
	Returns the character position of the last occurrence where the argument str is found in this string within the character range [pos,pos+n). More...
CUDA_DEVICE_CALLABLE size_type	rfind (const char *str, size_type bytes, size_type pos=0, size_type count=-1) const
	Returns the character position of the last occurrence where the array str is found in this string within the character range [pos,pos+n). More...
CUDA_DEVICE_CALLABLE size_type	rfind (char_utf8 character, size_type pos=0, size_type count=-1) const
	Returns the character position of the last occurrence where character is found in this string within the character range [pos,pos+n). More...
CUDA_DEVICE_CALLABLE string_view	substr (size_type start, size_type length) const
	Return a sub-string of this string. The original string and device memory must still be maintained for the lifetime of the returned instance. More...
CUDA_HOST_DEVICE_CALLABLE	string_view ()
	Default constructor represents an empty string.
CUDA_HOST_DEVICE_CALLABLE	string_view (const char *data, size_type bytes)
	Create instance from existing device char array. More...
	string_view (const string_view &)=default
	string_view (string_view &&)=default
string_view &	operator= (const string_view &)=default
string_view &	operator= (string_view &&)=default

Detailed Description

A non-owning, immutable view of device data that is a variable length char array representing a UTF-8 string.

The caller must maintain the device memory for the lifetime of this instance.

This may be used to wrap a device pointer and size but any member function that requires accessing the device memory must be called from a kernel.

Definition at line 63 of file string_view.hpp.

Constructor & Destructor Documentation

string_view()

CUDA_HOST_DEVICE_CALLABLE cudf::string_view::string_view ( const char *  data, size_type  bytes  )

inline

Create instance from existing device char array.

Parameters

data	Device char array encoded in UTF8.
bytes	Number of bytes in data array.

Definition at line 304 of file string_view.hpp.

Member Function Documentation

byte_offset()

__device__ size_type cudf::string_view::byte_offset ( size_type  pos ) const

inline

Return the byte offset from data() for a given character position.

Parameters

pos	Character position

Definition at line 207 of file string_view.cuh.

compare() [1/2]

__device__ int cudf::string_view::compare ( const char *  str, size_type  bytes  ) const

inline

Comparing target string with this string. Each character is compared as a UTF-8 code-point value.

Parameters

str	Target string to compare with this string.
bytes	Number of bytes in str.

Returns

0 If they compare equal. <0 Either the value of the first character of this string that does not match is lower in the arg string, or all compared characters match but the arg string is shorter. >0 Either the value of the first character of this string that does not match is greater in the arg string, or all compared characters match but the arg string is longer.

Definition at line 226 of file string_view.cuh.

compare() [2/2]

__device__ int cudf::string_view::compare ( const string_view &  str ) const

inline

Comparing target string with this string. Each character is compared as a UTF-8 code-point value.

Parameters

str	Target string to compare with this string.

Returns

0 If they compare equal. <0 Either the value of the first character of this string that does not match is lower in the arg string, or all compared characters match but the arg string is shorter. >0 Either the value of the first character of this string that does not match is greater in the arg string, or all compared characters match but the arg string is longer.

Definition at line 221 of file string_view.cuh.

find() [1/3]

__device__ size_type cudf::string_view::find ( char_utf8  character, size_type  pos = 0, size_type  count = -1  ) const

inline

Returns the character position of the first occurrence where character is found in this string within the character range [pos,pos+n).

Parameters

character	Single encoded character.
pos	Character position to start search within this string.
count	Number of characters from pos to include in the search. Specify -1 to indicate to the end of the string.

Returns

-1 if arg string is not found in this string.

Definition at line 309 of file string_view.cuh.

find() [2/3]

__device__ size_type cudf::string_view::find ( const char *  str, size_type  bytes, size_type  pos = 0, size_type  count = -1  ) const

inline

Returns the character position of the first occurrence where the array str is found in this string within the character range [pos,pos+n).

Parameters

str	Target array to search within this string.
bytes	Number of bytes in str.
pos	Character position to start search within this string.
count	Number of characters from pos to include in the search. Specify -1 to indicate to the end of the string.

Returns

-1 if arg string is not found in this string.

Definition at line 281 of file string_view.cuh.

find() [3/3]

__device__ size_type cudf::string_view::find ( const string_view &  str, size_type  pos = 0, size_type  count = -1  ) const

inline

Returns the character position of the first occurrence where the argument str is found in this string within the character range [pos,pos+n).

Parameters

str	Target string to search within this string.
pos	Character position to start search within this string.
count	Number of characters from pos to include in the search. Specify -1 to indicate to the end of the string.

Returns

-1 if str is not found in this string.

Definition at line 274 of file string_view.cuh.

operator[]()

__device__ char_utf8 cudf::string_view::operator[] ( size_type  pos ) const

inline

Return single UTF-8 character at the given character position.

Parameters

pos	Character position

Definition at line 198 of file string_view.cuh.

rfind() [1/3]

__device__ size_type cudf::string_view::rfind ( char_utf8  character, size_type  pos = 0, size_type  count = -1  ) const

inline

Returns the character position of the last occurrence where character is found in this string within the character range [pos,pos+n).

Parameters

character	Single encoded character.
pos	Character position to start search within this string.
count	Number of characters from pos to include in the search. Specify -1 to indicate to the end of the string.

Returns

-1 if arg string is not found in this string.

Definition at line 350 of file string_view.cuh.

rfind() [2/3]

__device__ size_type cudf::string_view::rfind ( const char *  str, size_type  bytes, size_type  pos = 0, size_type  count = -1  ) const

inline

Returns the character position of the last occurrence where the array str is found in this string within the character range [pos,pos+n).

Parameters

str	Target string to search with this string.
bytes	Number of bytes in str.
pos	Character position to start search within this string.
count	Number of characters from pos to include in the search. Specify -1 to indicate to the end of the string.

Returns

-1 if arg string is not found in this string.

Definition at line 323 of file string_view.cuh.

rfind() [3/3]

__device__ size_type cudf::string_view::rfind ( const string_view &  str, size_type  pos = 0, size_type  count = -1  ) const

inline

Returns the character position of the last occurrence where the argument str is found in this string within the character range [pos,pos+n).

Parameters

str	Target string to search within this string.
pos	Character position to start search within this string.
count	Number of characters from pos to include in the search. Specify -1 to indicate to the end of the string.

Returns

-1 if arg string is not found in this string.

Definition at line 316 of file string_view.cuh.

substr()

__device__ string_view cudf::string_view::substr ( size_type  start, size_type  length  ) const

inline

Return a sub-string of this string. The original string and device memory must still be maintained for the lifetime of the returned instance.

Parameters

start	Character position to start the sub-string.
length	Number of characters from start to include in the sub-string.

Returns

New instance pointing to a subset of the characters within this instance.

Definition at line 358 of file string_view.cuh.

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

• string_view.hpp
• string_view.cuh