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C++ What is the std::for_each() function parameter type?


C++ What is the std::for_each() function parameter type?

By : emesar ITPL
Date : November 26 2020, 01:01 AM
wish helps you Here are a couple of snippets from my first successful use of the std::for_each() construct: , This is usually done through templates:
code :


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std::for_each, calling member function with reference parameter

std::for_each, calling member function with reference parameter


By : nichehole
Date : March 29 2020, 07:55 AM
will be helpful for those in need This is a problem with the design of . You either have to use boost::bind or tr1::bind.
In C++ how can I use a template function as the 3rd parameter in std::for_each?

In C++ how can I use a template function as the 3rd parameter in std::for_each?


By : geetika
Date : March 29 2020, 07:55 AM
I wish this helpful for you I am trying to use std::for_each to output the contents of vectors, which may contain different types. So I wrote a generic output function like so: , Try:
code :
std::for_each(vec_out.begin(), vec_out.end(), output<T>);
How to call a member function on a parameter with std::for_each and boost::bind?

How to call a member function on a parameter with std::for_each and boost::bind?


By : Umer Kayani
Date : March 29 2020, 07:55 AM
it should still fix some issue I want to add a series of strings to a combo box using std::for_each. The objects are of type Category and I need to call GetName on them. How can I achieve this with boost::bind?
code :
std::for_each(categories.begin(), categories.end(), boost::bind(&CComboBox::AddString, &comboBox, boost::bind(&Category::GetName, _1)));
Why isn't there a for_each member function for each collection type in stl?

Why isn't there a for_each member function for each collection type in stl?


By : user3491422
Date : March 29 2020, 07:55 AM
this one helps. This is the standard design rationale for the entire library: Separate containers from algorithms.
If you did it your way, you'd have to implement every feature X for every container Y, leading you to M * N implementations if you have M features and N containers.
passing std::function as a parameter to for_each

passing std::function as a parameter to for_each


By : Brandi Fetchen
Date : March 29 2020, 07:55 AM
I hope this helps you . , I think what you want is the following
code :
#include <iostream>
#include <vector>
#include <functional>

std::function<void(int)> sample_function =  [](int x)
{
    if (x > 5)  std::cout << x << ' ';
};


int main()
{
    std::vector<int> numbers{ 1, 2, 3, 4, 5, 10, 15, 20, 25, 35, 45, 50 };
    std::for_each(numbers.begin(), numbers.end(), sample_function);
}
10 15 20 25 35 45 50
#include <iostream>
#include <vector>
#include <functional>

std::function<void(int)> sample_function()
{
    return  [](int x)
            {
                if (x > 5)  std::cout << x << ' ';
            };
}


int main()
{
    std::vector<int> numbers{ 1, 2, 3, 4, 5, 10, 15, 20, 25, 35, 45, 50 };
    std::for_each(numbers.begin(), numbers.end(), sample_function() );
}
    std::for_each(numbers.begin(), numbers.end(), sample_function() );
                                                                ^^^^
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