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SOLUTIONS
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MATHEMATICA MATHLINK C FUNCTION
MLTestHead()
int MLTestHead(MLINK link, const char *head, int *n)
tests that the next object to be read from link is an expression with head head, and stores the number of arguments of the expression in n.
DetailsDetails
- MLTestHead() fails if the current object on the link is not a function with a symbol as a head, or if the name of the symbol does not match head.
- MLTestHead() returns 0 in the event of an error, and a nonzero value if the function succeeds.
- Use MLError() to retrieve the error code if MLTestHead() fails.
- MLTestHead() is declared in the MathLink header file mathlink.h.
ExamplesExamplesopen allclose all
Basic Examples (1)Basic Examples (1)
#include "mathlink.h"
/* test whether the head of the incoming object is "ReturnPacket" */
void f(MLINK lp)
{
int args;
if(MLTestHead(lp, "ReturnPacket", &args))
{ /* read the contents of the ReturnPacket[] */ }
else
{ /* the head of incoming packet is not "ReturnPacket" */ }
}
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