pozdneev

These are the Mermaid versions of the diagrams I created for my https://stackoverflow.com/q/68229841/1800052 question.

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pozdneev

// g++ -std=c++14 -c mem_fn.cpp
#include <vector>
#include <functional>
#include <algorithm>

using namespace std;

struct A {
    int& getAttribute();
    const int& getAttribute() const;

pozdneev

// g++ -std=c++14 -c mem_fn.cpp
//
// /usr/include/c++/7/bits/stl_algo.h:4306:24:
//      error: no match for call to ‘(std::_Mem_fn<int& (A::*)()>) (const A&)’
//
// /usr/include/c++/7/functional:174:27:
//      error: no matching function for call to ‘__invoke(int& (A::* const&)(), const A&)’
//
// /usr/include/c++/7/bits/invoke.h:89:5:
//      error: no type named ‘type’ in ‘struct std::__invoke_result<int& (A::* const&)(), const A&>’

pozdneev

// g++ -std=c++14 -c mem_fn.cpp 
#include <vector>
#include <functional>
#include <algorithm>

using namespace std;

struct A {
    const int& getAttribute() const;
};

pozdneev

// g++ -std=c++14 -c mem_fn.cpp
//
// error: no matching function for call to ‘mem_fn(<unresolved overloaded function type>)’
#include <vector>
#include <functional>
#include <algorithm>

using namespace std;

struct A {

pozdneev

Py4J Multiple GatewayServer and CallbackServer instances

Compile and run TestApplication.java with py4j.jar in your classpath.

Then execute python3 test.py

Explanations

This creates three pairs of GatewayServer and CallbackServer with different ports on both the Java and Python sides. Python is driving the communication by asking Java to print

pozdneev

integer, save :: num_calls = 0
character(len=1024) :: file_suffix

num_calls = num_calls + 1
write (file_suffix, "(I5.5)") num_calls

open(37, file='prefix_' // trim(file_suffix) // '.bin', form='unformatted')

pozdneev

program uio
  real :: a(10), b(12)
  a(:) = 1
  b(:) = 2

  open(37, file='uio.bin', form='unformatted')
  write(37) a, b
  close(37)

  open(37, file='uio.bin', form='unformatted')

pozdneev

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;

public class IteratorRemove {
    static public void main(String[] args) {
        // Populate a collection
        Collection<Integer> ll = new LinkedList<>();
        for (int i = 0; i < 10; ++i) {
            ll.add(i);

pozdneev

public class SpeakingEnum {
    public static enum SPEAKING_ENUM {
        SOME_VALUE,
        SOME_OTHER_VALUE;

        public void speak() {
            System.out.println("this=" + this);
        }
    }