Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
is_pod template in C++
In this article we will be discussing the working, syntax and examples of std::is_pod template in C++ STL.
is_ pod is a template which comes under <type_traits> header file. This template is used to check whether the given type T is a POD(plain-old-data) type or not.
What is POD(Plain old data)?
Plain old data(POD) types are those types which are also in old C language. POD types also include scalar types. POD class type is that class type which is both, trivial (which can be initialised statically) and standard layout (which is a simple data structure like struct and union).
Syntax
template <class T> is_pod;
Parameters
The template can have only parameter of type T, and check whether the given type is a Plain Old Data type or not.
Return value
It returns a Boolean value, true if the given type is a Plain Old Data, and false if the given type is not a Plain Old Data.
Example
Input: class final_abc{ final_abc(); };
is_pod<final_abc>::value;
Output: False
Input: is_pod<int>::value;
Output: TrueExample
#include <iostream>
#include <type_traits>
using namespace std;
struct TP_1 {
int var_1;
};
struct TP_2 {
int var_2;
private:
int var_3;
};
struct TP_3 {
virtual void dummy();
};
int main() {
cout << boolalpha;
cout << "checking for is_pod:";
cout << "\nTP_1: " << is_pod<TP_1>::value;
cout << "\nTP_2: " << is_pod<TP_2>::value;
cout << "\nTP_3: " << is_pod<TP_3>::value;
return 0;
}Output
If we run the above code it will generate the following output −
checking for is_pod: TP_1: true TP_2: false TP_3: false
Example
#include <iostream>
#include <type_traits>
using namespace std;
class TP_1 {
int var_1;
};
class TP_2 {
int var_2;
private:
int var_3;
};
class TP_3 {
virtual void dummy();
};
int main() {
cout << boolalpha;
cout << "checking for is_pod:";
cout << "\nTP_1: " << is_pod<TP_1>::value;
cout << "\nTP_2: " << is_pod<TP_2>::value;
cout << "\nTP_3: " << is_pod<TP_3>::value;
return 0;
}Output
If we run the above code it will generate the following output −
checking for is_pod: TP_1: true TP_2: true TP_3: false
106 Views
