Question

How to use bind function with placeholders in C++

Answer 1

#include <iostream> 
#include <functional> 

using namespace std; 
  
void f(int a, int b) { 
    cout << a << " " << b << endl; 
} 
  
int main() 
{ 
    using namespace std::placeholders;
    
    auto fn =  bind(f, _1, 33); 
  
    fn(100); 

    return 0; 
} 



/*
run:

100 33

*/

 

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Answer 2

#include <iostream> 
#include <functional> 

using namespace std; 
  
void f(int a, int b) { 
    cout << a << " " << b << endl; 
} 
  
int main() 
{ 
    using namespace std::placeholders;
    
    auto fn =  bind(f, 99, _1); 
  
    fn(20); 

    return 0; 
} 



/*
run:

99 20

*/

 

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Answer 3

#include <iostream> 
#include <functional> 

using namespace std; 
  
void f(int a, int b) { 
    cout << a << " " << b << endl; 
} 
  
int main() 
{ 
    using namespace std::placeholders;
    
    auto fn =  bind(f, _1, _2); 
  
    fn(16, 98); 

    return 0; 
} 



/*
run:

16 98

*/

 

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Answer 4

#include <iostream> 
#include <functional> 

using namespace std; 
  
void f(int a, int b) { 
    cout << a << " " << b << endl; 
} 
  
int main() 
{ 
    using namespace std::placeholders;
    
    auto fn =  bind(f, _2, _1); 
  
    fn(16, 98); 

    return 0; 
} 



/*
run:

98 16

*/

 

70+ SQL courses for beginners and professionals