FAsciiSet | Unreal Engine 5.7 Documentation

ASCII character bitset useful for fast and readable parsing

Entirely constexpr. Works with both wide and narrow strings.

Example use cases:

constexpr FAsciiSet WhitespaceCharacters(" \v\f\t\r\n"); bool bIsWhitespace = WhitespaceCharacters.Test(MyChar); const char* HelloWorld = FAsciiSet::Skip(" \t\tHello world!", WhitespaceCharacters);

constexpr FAsciiSet XmlEscapeChars("&<>"'"); check(FAsciiSet::HasNone(EscapedXmlString, XmlEscapeChars));

constexpr FAsciiSet Delimiters(".:;"); const TCHAR* DelimiterOrEnd = FAsciiSet::FindFirstOrEnd(PrefixedName, Delimiters); FString Prefix(PrefixedName, DelimiterOrEnd - PrefixedName);

constexpr FAsciiSet Slashes("/\"); const TCHAR* SlashOrEnd = FAsciiSet::FindLastOrEnd(PathName, Slashes); const TCHAR* FileName = *SlashOrEnd ? SlashOrEnd + 1 : PathName;


Name	FAsciiSet
Type	class
Header File	/Engine/Source/Runtime/Core/Public/Misc/AsciiSet.h
Include Path	#include "Misc/AsciiSet.h"

Syntax

class FAsciiSet

Constructors

Name	Remarks	Include Path	Unreal Specifiers
constexpr FAsciiSet ( uint64 Lo, uint64 Hi )		Misc/AsciiSet.h
constexpr FAsciiSet ( InitData Bitset )		Misc/AsciiSet.h
constexpr FAsciiSet ( const CharType(&) Chars )		Misc/AsciiSet.h

Structs

Name	Remarks
InitData	Work-around for constexpr limitations.

Constants

Name	Type	Remarks	Include Path
NilMask	uint64		Misc/AsciiSet.h

Variables

Protected

Name	Type	Remarks	Include Path	Unreal Specifiers
HiMask	uint64		Misc/AsciiSet.h
LoMask	uint64		Misc/AsciiSet.h

Functions

Public

Name	Remarks	Include Path	Unreal Specifiers
bool Contains ( CharType Char ) const	Returns true if a character is part of the set	Misc/AsciiSet.h
uint64 Test ( CharType Char ) const	Returns non-zero if a character is part of the set.	Misc/AsciiSet.h

Static

Name	Remarks	Include Path
static const CharType * FindFirst ( FAsciiSet Set, const CharType* It, const CharType* End )		Misc/AsciiSet.h
static const CharType * FindFirstOrEnd ( const CharType* Str, FAsciiSet Set )	Find first character of string inside set or end pointer. Never returns null.	Misc/AsciiSet.h
static const CharType * FindLast ( FAsciiSet Set, const CharType* It, const CharType* End )		Misc/AsciiSet.h
static const CharType * FindLastOrEnd ( const CharType* Str, FAsciiSet Set )	Find last character of string inside set or end pointer. Never returns null.	Misc/AsciiSet.h
static StringType FindPrefixWith ( const StringType& Str, FAsciiSet Set )	Get initial substring with all characters in set	Misc/AsciiSet.h
static StringType FindPrefixWithout ( const StringType& Str, FAsciiSet Set )	Get initial substring with no characters in set	Misc/AsciiSet.h
static StringType FindSuffixWith ( const StringType& Str, FAsciiSet Set )	Get trailing substring with all characters in set	Misc/AsciiSet.h
static StringType FindSuffixWithout ( const StringType& Str, FAsciiSet Set )	Get trailing substring with no characters in set	Misc/AsciiSet.h
static bool HasAny ( const StringType& Str, FAsciiSet Set )	Test if string contains any character in set	Misc/AsciiSet.h
static bool HasAny ( const CharType* Str, FAsciiSet Set )	Test if string contains any character in set	Misc/AsciiSet.h
static bool HasNone ( const StringType& Str, FAsciiSet Set )	Test if string contains no character in set	Misc/AsciiSet.h
static bool HasNone ( const CharType* Str, FAsciiSet Set )	Test if string contains no character in set	Misc/AsciiSet.h
static bool HasOnly ( const StringType& Str, FAsciiSet Set )	Test if string contains any character outside of set	Misc/AsciiSet.h
static bool HasOnly ( const CharType* Str, FAsciiSet Set )	Test if string contains any character outside of set	Misc/AsciiSet.h
static StringType Scan ( const StringType& Str, FAsciiSet Set )		Misc/AsciiSet.h
static void SetImpl ( InitData& Bitset, uint32 Char )		Misc/AsciiSet.h
static const CharType * Skip ( const CharType* Str, FAsciiSet Set )	Find first character of string outside of set. Never returns null.	Misc/AsciiSet.h
static InitData StringToBitset ( const CharType(&) Chars )		Misc/AsciiSet.h
static StringType TrimPrefixWith ( const StringType& Str, FAsciiSet Set )	Trim initial characters in set	Misc/AsciiSet.h
static StringType TrimPrefixWithout ( const StringType& Str, FAsciiSet Set )	Trim initial characters not in set	Misc/AsciiSet.h
static StringType TrimSuffixWith ( const StringType& Str, FAsciiSet Set )	Trim trailing characters in set	Misc/AsciiSet.h
static StringType TrimSuffixWithout ( const StringType& Str, FAsciiSet Set )	Trim trailing characters not in set	Misc/AsciiSet.h

Operators

Name	Remarks	Include Path
FAsciiSet operator& ( FAsciiSet OtherSet ) const	Create new set containing only the characters that exist in both this and another specified set	Misc/AsciiSet.h
FAsciiSet operator\| ( FAsciiSet OtherSet ) const	Create new set containing the combination of this set and another	Misc/AsciiSet.h
FAsciiSet operator~()	Create new set containing inverse set of characters - likely including null-terminator	Misc/AsciiSet.h
FAsciiSet operator+ ( char Char ) const	Create new set with specified character in it	Misc/AsciiSet.h

Navigation