Geek Answers Handbook

Segmentation error when calling "new" in C ++?

I got segfault when trying to call "new" to create a pointer and insert it into the vector. Code that I click on an element in a vector:

queue->push_back(new Box(gen_id, Interval(x_mid, x_end), Interval(y_mid-y_halfwidth, y_mid+y_halfwidth)));

Basically Box is a class, and the constructor just takes 3 arguments, generation_idand 2 Intervals. I printed the contents in a vector before and after this "push", before:

[ -0.30908203125, -0.3087158203125 ] , [ -0.951416015625, -0.9510498046875 ]
[ -0.3087158203125, -0.308349609375 ] , [ -0.951416015625, -0.9510498046875 ]
[ -0.30908203125, -0.3087158203125 ] , [ -0.9510498046875, -0.95068359375 ]
[ -0.3087158203125, -0.308349609375 ] , [ -0.9510498046875, -0.95068359375 ]

after

[ -0.30908203125, -0.3087158203125 ] , [ -0.951416015625, -0.9510498046875 ]
[ -0.3087158203125, -0.308349609375 ] , [ -0.951416015625, -0.9510498046875 ]
[ 8.9039208750109844342e-243, 6.7903818933216500424e-173 ] , [ -0.9510498046875, -0.95068359375 ]
[ -0.3087158203125, -0.308349609375 ] , [ -0.9510498046875, -0.95068359375 ]
[ -0.3087158203125, -0.308349609375 ] , [ -0.95123291015625, -0.95086669921875 ]

I have no idea why this is happening, but apparently one element is damaged there. There are no other codes between these two result sets besides push, and I used gdb to confirm this. In addition, I checked these variables 2 Intervals, and gave me a result that makes sense.

: "" segfault? ? .

+5
2

, new, segfault, , , , / .

Valgrind , Linux.

+9

, new segfault; , , . , , .

printf("Creating the first interval...\n");
Interval a(x_mid, x_end);
printf("Creating the second interval...\n");
Interval b(y_mid-y_halfwidth, y_mid + y_halfwidth);
printf("Creating the box...\n");
Box* box_to_enqueue = new Box(gen_id, a, b);
printf("Enqueueing the box...\n");
// Do you really want to enqueue a pointer instead of a Box?
queue->push_back(box_to_enqueue);
+2

More articles:


All Articles