Question

What is type deduction in C++?

Answer 1

Type inference or deduction refers to the automatic detection of the data type of an expression in a programming language. It is a feature present in some strongly statically typed languages. In C++, the auto keyword(added in C++ 11) is used for automatic type deduction. For example, you want to create an iterator to iterate over a vector, you can simply use auto for that purpose.

Example

#include<iostream>

#include<vector>

using namespace std;

int main() {

vector<int> arr(10);

for(auto it = arr.begin(); it != arr.end(); it ++) {

cin >> *it;

}

return 0;

}

In the above program, it will automatically get the type std::vector<int>::iterator.

Answer 2

Type deduction relates to the automated identification in the language of the information medium.

Explanation:

• Type deduction is a function that is inherent in certain highly typesafe languages.
• The auto keyword(added in C++ 11) is used for automatic form deduction in C++.
• Until C++ 11, every data form must be explicitly labeled at collate time, restricting the standards of the interpretation at serialization, after the version of C++, an amount of search terms have been included that allow the programmer to abandon the type allowance to the assembler as a whole.

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