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if_else.hpp File Reference
`#include <boost/math/tools/promotion.hpp>`

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## Namespaces
| stan
| stan::math
| Matrices and templated mathematical functions.

## Functions
template<typename T_true , typename T_false >
boost::math::tools::promote_args< T_true, T_false >::type | stan::math::if_else (const bool c, const T_true y_true, const T_false y_false)
| Return the second argument if the first argument is true and otherwise return the second argument. More...

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