FString

class Core Since 4.0

#include "Containers/UnrealString.h"

Description

Unreal Engine's general-purpose heap-allocated string class. Stores a dynamically-sized, null-terminated array of TCHARs with full value semantics.

• FString uses TCHAR (UTF-16 on Windows). Always wrap string literals in TEXT("...") to avoid narrowing-conversion warnings and encoding mismatches.
• FString has value semantics — assignment and copy both allocate new memory. Pass as const FString& or FStringView in function parameters to avoid unnecessary allocations.
• The dereference operator *MyStr returns a raw TCHAR* to the internal buffer. This pointer is invalidated if the string is modified or destroyed.

Create and concatenate strings C++

FString Name = TEXT("Alice");
FString Greeting = TEXT("Hello, ") + Name + TEXT("!");
UE_LOG(LogTemp, Log, TEXT("%s"), *Greeting);

Utility

7 ▼

Access	Type	Name	Description
public	function	FString::EndsWith	Returns true if this string ends with the specified suffix.
public	function	FString::StartsWith	Returns true if this string begins with the specified prefix.
public	function	FString::Contains	Returns true if this string contains the specified substring.
public	function	FString::Format	Builds a string by substituting {Name} or {0}/{1}/.
public	function	FString::Printf	Constructs a new FString using printf-style format specifiers.
public	function	FString::ToLower	Returns a new FString with all characters converted to lowercase.
public	function	FString::ToUpper	Returns a new FString with all characters converted to uppercase.

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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