Copy-constructed mt19937_64 segfaults

[Tim Cooijmans <t.cooijmans@…>]

The copy constructor for mt19937_64 seems to leave the copy in a corrupt state. Trying to generate random numbers from the copy consistently results in a segmentation fault.

The attached file exhibits the problem:

$ g++ -std=c++11 -g -O0 main.cpp && ./a.out 5 5 $ g++ -std=c++11 -g -O0 -DUSE_64BIT main.cpp && ./a.out 1 Segmentation fault (core dumped)

The version of g++ used is "g++-4.8 (Ubuntu 4.8.1-2ubuntu1~12.04) 4.8.1".

[Tim Cooijmans <t.cooijmans@…>]

Okay, I should have previewed. This is the terminal session with proper formatting:

$ g++ -std=c++11 -g -O0 main.cpp && ./a.out
5
5
$ g++ -std=c++11 -g -O0 -DUSE_64BIT main.cpp && ./a.out
1
Segmentation fault (core dumped)

[Steven Watanabe]

return_generator returns a dangling reference to the local generator.