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Thread get_id() function in C++

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  • Last Updated : 16 Jun, 2021
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Thread::get_id() is an in-built function in C++ std::thread. It is an observer function which means it observes a state and then returns the corresponding output. This function returns the value of std::thread::id thus identifying the thread associated with *this.


Parameters: This function does not accept any parameters.
Return Value: This method returns a value of type std::thread::id identifying the thread associated with *this i.e. the thread which was used to call the get_id function is returned. The default constructed std::thread::id is returned when no such thread is identified.
Below examples demonstrates the use of std::thread::get_id() method:
Note: On the online IDE this program will show error. To compile this, use the flag “-pthread” on g++ compilers compilation with the help of command “g++ –std=c++14 -pthread file.cpp”.


// C++ program to demonstrate the use of
// std::thread::get_id
#include <chrono>
#include <iostream>
#include <thread>
using namespace std;
// util function for thread creation
void sleepThread()
int main()
    // creating thread1 and thread2
    thread thread1(sleepThread);
    thread thread2(sleepThread);
    thread::id t1_id = thread1.get_id();
    thread::id t2_id = thread2.get_id();
    cout << "ID associated with thread1= "
         << t1_id << endl;
    cout << "ID associated with thread2= "
         << t2_id << endl;
    return 0;

Possible Output: 

ID associated with thread1= 139858743162624
ID associated with thread2= 139858734769920


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