/* shared_future */
int factorial(shared_future<int> f) {
// do something else
int N = f.get(); // If promise is distroyed, exception: std::future_errc::broken_promise
f.get();
cout << "Got from parent: " << N << endl;
int res = 1;
for (int i=N; i>1; i--)
res *= i;
return res;
}
void fut_wait(){
thread::id tid = this_thread::get_id();
while(fut.valid()){
fut.wait();
bool ret = fut.get();
COUT << tid << " ret:" << ret << endl;
}
}
static TransData phaseCorrThr(const shared_future<FFTHolder> &fixFut, const shared_future<FFTHolder> &nbrFut, const fftwf_plan &c2rPlan, const PtPair &pair,
const Point2f &absHint, const map<GridPtOff, Mat> &hintToMask, const Size &imSz) {
//printf("phase %d %d, %d %d\n", pair[0][0], pair[0][1], pair[1][0], pair[1][1]);
float *buf = (float *)fftwf_malloc_thr(sizeof(float) * getFFTLen(imSz));
GridPtOff off = {{pair[1][0] - pair[0][0], pair[1][1] - pair[0][1]}}; // vector from fix to nbr
const Mat &mask = hintToMask.at(off);
Point2f hint = absHint;
hint.x *= off[0];
hint.y *= off[1];
FFTHolder fixFFT = fixFut.get();
FFTHolder nbrFFT = nbrFut.get();
/* testing
Mat fix(imSz.height, imSz.width + 2, CV_32F, fixFFT.fft);
Mat nbr(imSz.height, imSz.width + 2, CV_32F, nbrFFT.fft);
double minVal, maxVal;
Point minLoc2, maxLoc2;
minMaxLoc(fix, &minVal, &maxVal, &minLoc2, &maxLoc2);
printf("min: %lf, (%d, %d)\n", minVal, minLoc2.x, minLoc2.y);
printf("max: %lf, (%d, %d)\n", maxVal, maxLoc2.x, maxLoc2.y);
minMaxLoc(nbr, &minVal, &maxVal, &minLoc2, &maxLoc2);
printf("min: %lf, (%d, %d)\n", minVal, minLoc2.x, minLoc2.y);
printf("max: %lf, (%d, %d)\n", maxVal, maxLoc2.x, maxLoc2.y);
imshow("a", fix);
waitKey(0);
*/
double dist;
float conf;
Point maxLoc;
Point bestPt = phaseCorr(fixFFT.fft, nbrFFT.fft, imSz, c2rPlan, buf, hint, dist, mask, maxLoc, conf, getConfSumNbrs);
fftwf_free_thr(buf);
// printf("got conf %f old conf %f rat %f, maxLoc %d %d phase %d %d, %d %d, dist %lf, mask sz: %d %d\n\n", conf, oldConf, conf / 1000 / oldConf, maxLoc.x, maxLoc.y,
// pair[0][0], pair[0][1], pair[1][0], pair[1][1], dist, mask.size[1], mask.size[0]);
TransData dat(bestPt.x, bestPt.y, dist, conf);
//printf("done phase %d %d, %d %d\n", pair[0][0], pair[0][1], pair[1][0], pair[1][1]);
return dat;
}
void doSomething(char c, shared_future<int> f){
try{
//wait fornumber of character to print
int num = f.get(); //get result of queryNumber()
for (int i = 0; i < num; ++i)
{
this_thread::sleep_for(chrono::milliseconds(100));
cout.put(c).flush();
}
}catch(const exception& e){
cerr << "EXCEPTION in thread " << this_thread::get_id()
<< ": " << e.what() << endl;
}
}
template<typename T> inline exception_ptr get_exception_ptr(shared_future<T> &f)
{
#if 1
// Thanks to Vicente for adding this to Boost.Thread
return f.get_exception_ptr();
#else
// This seems excessive but I don't see any other legal way to extract the exception ...
bool success=false;
try
{
f.get();
success=true;
}
catch(...)
{
exception_ptr e(afio::make_exception_ptr(afio::current_exception()));
assert(e);
return e;
}
return exception_ptr();
#endif
}
int promiseDependingFunction2(shared_future<int> sfu) {
int value = sfu.get();
return value*2;
}