TVariantArray

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This set of classes enables building nested TVariant structures using shared pointers to TArrays and TMaps. This can be extended to other core container types or custom types as needed. If this proves useful beyond online use cases, this could move to Core.

This allows for usage such as:

using FNestedVariant = TNestedVariant; // The first FString is the TMap key type. FNestedVariant::FMapRef Data = FNestedVariant::FMap::CreateVariant();

Data->AddVariant(TEXT("MyString"), FString(TEXT("1234-5678-9000"))); Data->AddVariant(TEXT("MyInt"), 42LL); Data->AddVariant(TEXT("MyObject"), FNestedVariant::FMap::CreateVariant())->AddVariant(TEXT("MyNestedObjectDouble"), 1.0); FNestedVariant::FArrayRef& Array = Data->AddVariant(TEXT("MyArray"), FNestedVariant::FArray::CreateVariant());

Array->AddVariant(FNestedVariant::FMap::CreateVariant())->AddVariant(TEXT("MyNestedArrayObjectInt"), 100LL); Array->AddVariant(FNestedVariant::FArray::CreateVariant())->AddVariant(1.23); Array->AddVariant(4.0); Array->AddVariant(true);

FNestedVariant::FMapPtr NestedMap; if (Array->GetVariant(0, NestedMap)) { // Found nested map in array. }

double ArrayDouble; if (Array->GetVariant(2, ArrayDouble)) { ... }

int64 MyInt; if (Data->GetVariant(TEXT("MyInt"), MyInt)) { ... }

FNestedVariant::FArrayPtr NestedArray; if (Data->GetVariant(TEXT("MyArray"), NestedArray)) { bool Value; if (NestedArray->GetVariant(3, Value)) { ... } }

OnlineUtils.h has ToLogString() overrides to allow for: ToLogString(Data); Which would output: {MyString:1234-5678-9000, MyInt:42, MyObject:{MyNestedObjectDouble:1.00}, MyArray:[{MyNestedArrayObjectInt:100}, [1.23], 4.00, true]} TArray that holds a TVariant with helper functions for working with variant types.

Syntax

template<typename... ValueTypes>  
class TVariantArray :  
    public TArray< TVariant< ValueTypes... > > ,  
    public TSharedFromThis< TVariantArray< ValueTypes... > >  
Copy full snippet

template<typename... ValueTypes> class TVariantArray :     public TArray< TVariant< ValueTypes... > > ,     public TSharedFromThis< TVariantArray< ValueTypes... > >

Inheritance Hierarchy

• FSharedFromThisBase → TSharedFromThis → TVariantArray
• TArray → TVariantArray

Derived Classes

• TNestedVariantArray

Typedefs

Functions

Public

Static