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/*         SCIP --- Solving Constraint Integer Programs                      */
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**@file   expr_log.h
 * @ingroup EXPRHDLRS
 * @brief  logarithm expression handler
 * @author Stefan Vigerske
 * @author Benjamin Mueller
 */

/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/

#ifndef __SCIP_EXPR_LOG_H__
#define __SCIP_EXPR_LOG_H__


#include "scip/scip.h"

#ifdef __cplusplus
extern "C" {
#endif

/**@addtogroup EXPRHDLRS
 *
 * @{
 *
 * @name Logarithm expression
 *
 * This expression handler provides the natural logarithm function, that is,
 * \f[
 *   x \mapsto \ln(x).
 * \f]
 *
 * @{
 */

/** creates a logarithmic expression */
SCIP_EXPORT
SCIP_RETCODE SCIPcreateExprLog(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_EXPR**           expr,               /**< pointer where to store expression */
   SCIP_EXPR*            child,              /**< single child */
   SCIP_DECL_EXPR_OWNERCREATE((*ownercreate)), /**< function to call to create ownerdata */
   void*                 ownercreatedata     /**< data to pass to ownercreate */
   );

/** indicates whether expression is of log-type */
SCIP_EXPORT
SCIP_Bool SCIPisExprLog(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_EXPR*            expr                /**< expression */
   );

/** @}
  * @}
  */

/** creates the handler for logarithmic expression and includes it into SCIP
 *
 * @ingroup ExprhdlrIncludes
 */
SCIP_EXPORT
SCIP_RETCODE SCIPincludeExprhdlrLog(
   SCIP*                 scip                /**< SCIP data structure */
   );

#ifdef __cplusplus
}
#endif

#endif /* __SCIP_EXPR_LOG_H__ */
