Otherwise, the compiler will produce an error. Suppose we need to define a function outside of the class template. We can do this with the following code:. This is necessary and is part of the syntax. If we look at the code in Example 1 , we have a function getNum that is defined inside the class template Number. This program uses a class template to perform addition, subtraction, multiplication and division of two variables num1 and num2. The variables can be of any type, though we have only used int and float types in this example.
We also have add , subtract , multiply , and divide functions that have the return type T. We also have a void function displayResult that prints out the results of the other functions. In main , we have created two objects of Calculator : one for int data type and another for float data type. This prompts the compiler to create two class definitions for the respective data types during compilation. For example,. In this program, we have created a class template, named ClassTemplate , with three parameters, with one of them being a default parameter.
Can typeid function be used with the object of generic classes? Yes, only if default type is given b. String b. Integer c. Digit d. Answer: a. How is function overloading different from template class? Overloading is multiple function doing same operation, Template is multiple function doing different operations b. Overloading is single function doing different operations, Template is multiple function doing different operations c. Overloading is multiple function doing similar operation, Template is multiple function doing identical operations d.
Overloading is multiple function doing same operation, Template is same function doing different operations View Answer Report Discuss Too Difficult! Overloading is multiple function doing similar operation, Template is multiple function doing identical operations. What if static members are declared inside template classes?
All instances will share the static variable b. All instances will have their own static variable c.
All the instances will ignore the static variable d. All instances will have their own static variable. Send It! No, it must satisfy some specific conditions first.
Your example doesn't seem to be ambiguous. The call matches the second one parameter matches int exactly. Second func will reject some of the arguments accepted by the first func but not the other way around, which makes the template more specialized.
For a plain function call, if we would ignore this ordering, the call would be ambiguous, because the template parameter is deduced to int likewise. UncleBens: wow, thanks, I was totally unaware of the function template partial ordering scheme and all that. I've never stumbled upon it in real life. Good to know! Alexander Poluektov Alexander Poluektov 7, 1 1 gold badge 25 25 silver badges 30 30 bronze badges. I thank the commenters for their input, and for being so kind as to not vote me down Consider templating to be like the macro pre-processor, which expands defines before the compiler gets to see them.
Mawg says reinstate Monica Mawg says reinstate Monica 36k 94 94 gold badges silver badges bronze badges. The return type of a nontemplate function is not part of its signature cf. The comparison with preprocessor macros is rather flawed. There are special rules about overloads. It should be noted that a signature is not primarily used to determine whether something can be overloaded or not. See also open-std. RishiN RishiN 39 5 5 bronze badges.
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