Pregunta
I am trying to use std::set for arbitrary-length integer vectors defined from the NTL-Library and for some reason it doesn't work. It works totally fine with the ZZ integers defined by the library:
#include <NTL/ZZ.h>
#include <NTL/vec_ZZ.h>
#include <set>
NTL_CLIENT
int main(void){
std::set<ZZ> foo;
foo.insert(to_ZZ(1)); //works without problems
std::set<vec_ZZ> vectorFoo;
vec_ZZ vec;
vectorFoo.insert(vec); //causes compiler to crash
return 0;
}
Does anyone know why the first insertion works and the second doesn't?
Solución
std::set<T>
is ordered by std::less<T>
, which defaults to bool operator<(T,T)
. ZZ
does define a proper operator<
(they're ordered) but vec_ZZ
doesn't. In fact, most NTL classes don't, not even ZZ_p
. Therefore std::set<ZZ_p>
is equally invalid.
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