Method solution

test/float/trigonometric.cpp:359–363

%Test whether \a x is solution

       : Test("Trigonometric::ACos::XX::"+s,1,d,st,CPLT_ASSIGNMENT,false) {}
       /// %Test whether \a x is solution
       virtual MaybeType solution(const Assignment& x) const {
         if ((x[0].min() > 1.0) || (x[0].max() < -1.0))
           return MT_FALSE;
         return eq(acos(x[0]), x[0]);
       }
       /// Post constraint on \a x
       virtual void post(Gecode::Space& home, Gecode::FloatVarArray& x) {
         Gecode::acos(home, x[0], x[0]);