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What are the different ways of implementing Docker FROM?


What are the different ways of implementing Docker FROM?

By : user2955036
Date : November 22 2020, 10:33 AM
it helps some times You don't have to push your images to dockerhub to be able to use them as base images. But you need to build them locally so that they are stored in your local docker repository. You can not use an image as a base image based on a relative path such as ../Dockerfile- you must base your own images on other image files that exists in your local repository.
Let's say that your base image uses the following (in the Dockerfile):
code :
FROM        centos7:centos7
// More stuff...
docker build -t my/base .
docker build -t my/base:2.0 .
FROM        my/base


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What are the different ways of implementing multithreading in .net

What are the different ways of implementing multithreading in .net


By : juliani Jufri
Date : March 29 2020, 07:55 AM
wish helps you I like this explanations very much. Maybe they help you, too.
And then, there is this article by Jon Skeet, too.
ways of implementing constructor

ways of implementing constructor


By : user3487797
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further SetFrom is a method not a variable. If you want your constructor to be used like that you'll need something like the following.
code :
private String from;
private String to;
private String subject;

public Msg(String from, String to, String subject) {
    this.from = from;
    this.to = to;
    this.subject = subject;
}

public String getFrom() {
    return this.from;
}

public void setFrom(String from) {
    this.from = from;
}
Mongodb ways of implementing many to many?

Mongodb ways of implementing many to many?


By : Veronica Roxie
Date : March 29 2020, 07:55 AM
it fixes the issue It depends on your usecase.
The main question is do you actually know why you want to use MongoDB in the first place? Hopefully, the reason is not because of the trend. RDBMS's are still relevant and have their own usecases. For some applications RDBMS is the way to go for some it isn't.
Different ways of implementing atomic *=

Different ways of implementing atomic *=


By : Sal Ubrious
Date : March 29 2020, 07:55 AM
Any of those help Imagine between your call to load and compare_exchange_weak the value gets changed by another thread. expected has no longer the current value.
compare_exchange_weak works as follows:
code :
+----------- Thread 1 -----------+---------- Thread 2 ----------+
| ex = t1.load()                 |                              |
|                                | t1.store(42)                 |
| t1.cmp_xchg_w(ex, ex * t2)     |                              |
#include <type_traits>
#include <atomic>
#include <iostream>
#include <chrono>
#include <thread>

template <typename T, typename = std::enable_if_t<std::is_integral<T>::value>>
std::atomic<T>& operator*=(std::atomic<T>& t1, T t2) {
    using namespace std::chrono_literals;
    T expected = t1.load();
    std::this_thread::sleep_for(400ms);
    t1.compare_exchange_weak(expected, expected * t2);
    return t1;
}

int main() {
    std::atomic<int> t1 = 5;
    std::atomic<int> t2;
    std::thread th1([&](){
        t2 = (t1 *= 5).load();
    });
    std::thread th2([&](){
        using namespace std::chrono_literals;
        std::this_thread::sleep_for(100ms);
        t1.store(8);
    });

    th1.join();
    th2.join();

    std::cout << "Atomic t1: " << t1 << "\n";
    std::cout << "Atomic t2: " << t2 << "\n";
} 
Ways of implementing timer in iOS

Ways of implementing timer in iOS


By : Emil Sharafutdinov
Date : March 29 2020, 07:55 AM
around this issue Any time you are implementing a timer, the best option is always to record your start time. Then, whenever you update your interface, simply take the difference of the current time and your start time. You can then use NSTimers to trigger updates of the interface at certain periods.
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