ERROR: terminate called without an active exception on QT application #49
Description
main.cpp
#include "mainwindow.h"
#include <iostream>
#include <QApplication>
#include "async++.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
auto task1 = async::spawn([] {
std::cout << "Task 1 executes asynchronously" << std::endl;
});
auto task2 = async::spawn([]() -> int {
std::cout << "Task 2 executes in parallel with task 1" << std::endl;
return 42;
});
auto task3 = task2.then([](int value) -> int {
std::cout << "Task 3 executes after task 2, which returned "
<< value << std::endl;
return value * 3;
});
auto task4 = async::when_all(task1, task3);
auto task5 = task4.then([](std::tuple<async::task<void>,
async::task<int>> results) {
std::cout << "Task 5 executes after tasks 1 and 3. Task 3 returned "
<< std::get<1>(results).get() << std::endl;
});
task5.get();
std::cout << "Task 5 has completed" << std::endl;
async::parallel_invoke([] {
std::cout << "This is executed in parallel..." << std::endl;
}, [] {
std::cout << "with this" << std::endl;
});
async::parallel_for(async::irange(0, 5), [](int x) {
std::cout << x;
});
std::cout << std::endl;
int r = async::parallel_reduce({1, 2, 3, 4}, 0, [](int x, int y) {
return x + y;
});
std::cout << "The sum of {1, 2, 3, 4} is " << r << std::endl;
MainWindow w;
w.show();
return a.exec();
}
the window wouldn't show, and error message are:
terminate called without an active exception
terminate called recursively
terminate called recursively
how to run some tasks behind Window UI?