![]() If it is used improperly, it could produce undefined behavior.Ī popular example of a badly considered design is containers of top types, like the Java containers before Java generics were introduced, which requires downcasting of the contained objects so that they can be used again.C++Programs Fibonacci Series Prime Number Palindrome Number Factorial Armstrong Number Sum of digits Reverse Number Swap Number Matrix Multiplication Decimal to Binary Number in Characters Alphabet Triangle Number Triangle Fibonacci Triangle Char array to string in C++ Calculator Program in C++ Program to convert infix to postfix expression in C++ using the Stack Data Structure C++ program to merge two unsorted arrays C++ coin change program C++ program to add two complex numbers using class C++ program to find the GCD of two numbers C++ program to find greatest of four numbers Delete Operator in C++ How to concatenate two strings in c++ Upcasting and Downcasting in C++ C++ Dijkstra Algorithm using the priority queue Constructor overloading in C++ Default arguments in C++ Dynamic binding in C++ Dynamic memory allocation in C++ Fast input and output in C++ Hierarchical inheritance in C++ Hybrid inheritance in C++ Multiple Inheritance in C++ C++ Bitwise XOR Operator Different Ways to Compare Strings in C++ Reverse an Array in C++ C++ date and time Copy elision in C++ Array of sets in C++ Smart pointers in C++ Types of polymorphism in C++ Implementing the sets without C++ STL containers Scope Resolution Operator in C++ Static Member Function in C++ Const keyword in C++ Memset in C++ Type Casting in C++ Binary Operator Overloading in C++ Binary Search in C++ Inheritance in C++ vs JAVA Static Keyword in C++ and JAVA Exception Handling in C++ and JAVA Foreach in C++ and JAVA C++ templates vs. Compile-time downcasting is implemented by static_cast, but this operation performs no type check. In C++, run-time type checking is implemented through dynamic_cast. While we could also convert myObject to a compile-time String using the universal (), this would risk calling the default implementation of toString() where it was unhelpful or insecure, and exception handling could not prevent this. ![]() ![]() ![]() In this approach, downcasting prevents the compiler from detecting a possible error and instead causes a run-time error.ĭowncasting myObject to String ('(String)myObject') was not possible at compile time because there are times that myObject is String type, so only at run time can we figure out whether the parameter passed in is logical. Public static String objectToString ( Object myObject )
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