TOperatorJumpTable::MapPreUnary

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Unreal Engine C++ API Reference > Runtime > Core > Misc > TOperatorJumpTable

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template<typename OperatorType, typename FuncType>  
void MapPreUnary  
&40;  
    FuncType InFunc  
&41;  
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template<typename OperatorType, typename FuncType> void MapPreUnary &40;     FuncType InFunc &41;

Remarks

Map an expression node to a pre-unary operator with the specified implementation.

The callable type must match the declaration Ret(Operand[, Context]), where: Ret = Any DEFINE_EXPRESSION_NODE_TYPE type, OR FExpressionResult Operand = Any DEFINE_EXPRESSION_NODE_TYPE type Context = (optional) const ptr to user-supplied arbitrary context

Examples that binds a '!' token to a function that attempts to do a boolean 'not': JumpTable.MapPreUnary({ return !A; }); JumpTable.MapPreUnary({ if (Ctxt->IsBooleanNotOpEnabled()) { return !A; } else { return A; } }); JumpTable.MapPreUnary( -> FExpressionResult { if (Ctxt->IsBooleanNotOpEnabled()) { return MakeValue(!A); } return MakeError(FExpressionError(LOCTEXT("NotNotEnabled", "Boolean not is not enabled."))); });