/usr/include/trilinos/ROL_IdentityOperator.hpp is in libtrilinos-rol-dev 12.12.1-5.
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// Rapid Optimization Library (ROL) Package
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#ifndef ROL_IDENTITYOPERATOR_H
#define ROL_IDENTITYOPERATOR_H
#include "ROL_LinearOperator.hpp"
/** @ingroup func_group
\class ROL::IdentityOperator
\brief Multiplication by unity
*/
namespace ROL {
template<class Real>
class IdentityOperator : public LinearOperator<Real> {
void apply( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
Hv.set(v);
}
void applyInverse( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
Hv.set(v);
}
};
} // namespace ROL
#endif // ROL_NULLOPERATOR_H
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