to_ref_if() [2/2]

template<bool Cond, typename T , std::enable_if_t< Cond > * = nullptr>

ref_type_t< T && > stan::math::to_ref_if ( T &&  a )

inline

If the condition is true, evaluates expensive Eigen expressions.

If given expression involves no calculations this is a no-op that should be optimized away.

Template Parameters

Cond	condition
T	argument type (Eigen expression)

Parameters

a

argument

Returns

argument converted to Eigen::Ref

Definition at line 59 of file to_ref.hpp.