AHalfB
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class AHalfB : public feasst::Constraint
Constrain the number of the first type of particle, A, to be half of the number of the second type of particle, B.
Arguments
particle_type_A: particle type for A (default: 0).
particle_type_B: particle type for B (default: 1).
extra: allow |2*A - B| <= extra (default: 0).