GenericStringRef< CharType > Struct Template Reference#
Reference to a constant string (not taking a copy) More...
#include <document.h>
Public Types | |
typedef CharType | Ch |
character type of the string More... | |
Public Member Functions | |
template<SizeType N> | |
GenericStringRef (const CharType(&str)[N]) RAPIDJSON_NOEXCEPT | |
Create string reference from const character array. More... | |
GenericStringRef (const CharType *str) | |
Explicitly create string reference from const character pointer. More... | |
GenericStringRef (const CharType *str, SizeType len) | |
Create constant string reference from pointer and length. More... | |
GenericStringRef (const GenericStringRef &rhs) | |
operator const Ch * () const | |
implicit conversion to plain CharType pointer More... | |
Public Attributes | |
const Ch *const | s |
plain CharType pointer More... | |
const SizeType | length |
length of the string (excluding the trailing NULL terminator) More... | |
Related Functions | |
(Note that these are not member functions.) | |
template<typename CharType > | |
GenericStringRef< CharType > | StringRef (const CharType *str) |
Mark a character pointer as constant string. More... | |
template<typename CharType > | |
GenericStringRef< CharType > | StringRef (const CharType *str, size_t length) |
Mark a character pointer as constant string. More... | |
Detailed Description
template<typename CharType>
struct GenericStringRef< CharType >
Reference to a constant string (not taking a copy)
- Template Parameters
-
CharType character type of the string
This helper class is used to automatically infer constant string references for string literals, especially from const
(!) character arrays.
The main use is for creating JSON string values without copying the source string via an Allocator. This requires that the referenced string pointers have a sufficient lifetime, which exceeds the lifetime of the associated GenericValue.
Example
- See also
- StringRef, GenericValue::SetString
Member Typedef Documentation
◆ Ch
typedef CharType GenericStringRef< CharType >::Ch |
character type of the string
Constructor & Destructor Documentation
◆ GenericStringRef() [1/4]
|
inline |
Create string reference from const
character array.
This constructor implicitly creates a constant string reference from a const
character array. It has better performance than StringRef(const CharType*) by inferring the string length from the array length, and also supports strings containing null characters.
- Template Parameters
-
N length of the string, automatically inferred
- Parameters
-
str Constant character array, lifetime assumed to be longer than the use of the string in e.g. a GenericValue
- Postcondition
- s == str
- Note
- Constant complexity.
-
There is a hidden, private overload to disallow references to non-const character arrays to be created via this constructor. By this, e.g. function-scope arrays used to be filled via
snprintf
are excluded from consideration. In such cases, the referenced string should be copied to the GenericValue instead.
◆ GenericStringRef() [2/4]
|
inlineexplicit |
Explicitly create string reference from const
character pointer.
This constructor can be used to explicitly create a reference to a constant string pointer.
- See also
- StringRef(const CharType*)
- Parameters
-
str Constant character pointer, lifetime assumed to be longer than the use of the string in e.g. a GenericValue
- Postcondition
- s == str
- Note
- There is a hidden, private overload to disallow references to non-const character arrays to be created via this constructor. By this, e.g. function-scope arrays used to be filled via
snprintf
are excluded from consideration. In such cases, the referenced string should be copied to the GenericValue instead.
◆ GenericStringRef() [3/4]
|
inline |
Create constant string reference from pointer and length.
- Parameters
-
str constant string, lifetime assumed to be longer than the use of the string in e.g. a GenericValue len length of the string, excluding the trailing NULL terminator
- Note
- Constant complexity.
◆ GenericStringRef() [4/4]
|
inline |
Member Function Documentation
◆ operator const Ch *()
|
inline |
implicit conversion to plain CharType pointer
Friends And Related Function Documentation
◆ StringRef() [1/2]
|
related |
Mark a character pointer as constant string.
Mark a plain character pointer as a "string literal". This function can be used to avoid copying a character string to be referenced as a value in a JSON GenericValue object, if the string's lifetime is known to be valid long enough.
- Template Parameters
-
CharType Character type of the string
- Parameters
-
str Constant string, lifetime assumed to be longer than the use of the string in e.g. a GenericValue
- Returns
- GenericStringRef string reference object
- See also
- GenericValue::GenericValue(StringRefType), GenericValue::operator=(StringRefType), GenericValue::SetString(StringRefType), GenericValue::PushBack(StringRefType, Allocator&), GenericValue::AddMember
◆ StringRef() [2/2]
|
related |
Mark a character pointer as constant string.
Mark a plain character pointer as a "string literal". This function can be used to avoid copying a character string to be referenced as a value in a JSON GenericValue object, if the string's lifetime is known to be valid long enough.
This version has better performance with supplied length, and also supports string containing null characters.
- Template Parameters
-
CharType character type of the string
- Parameters
-
str Constant string, lifetime assumed to be longer than the use of the string in e.g. a GenericValue length The length of source string.
- Returns
- GenericStringRef string reference object
Member Data Documentation
◆ length
const SizeType GenericStringRef< CharType >::length |
length of the string (excluding the trailing NULL terminator)
◆ s
const Ch* const GenericStringRef< CharType >::s |
plain CharType pointer
The documentation for this struct was generated from the following file:
- /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-composable-kernel/checkouts/develop/include/rapidjson/document.h