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3.11.3 Ternary Operator Definition Example

A ternary operator named ‘$’‘~’ and evaluating as OPERAND1 * OPERAND2 ^ OPERAND3 for its real operands will be introduced by its leading binary operator definition:

See Binary Operator Definition Example.

const struct x1f4_operator_type def1lead {
    "$",
    NULL,
    0224,
    0,
    real2,
    X1f4_E4_E2ND_LINK,
    1,
    NULL,
    &def1lead_ext
};

See struct x1f4_operator_type.

The flags field says the second extension is to be observed.

The function and type fields are not interpreted for ternaries leading operator definition.

See Operator Flags.

The operator definition second extension introduced by its extension2 is:

const struct x1f4_2ndscope_type def1lead_ext = {
    X1f4_E4_RAIL_MARK | X1f4_E4_RAIL_ONLY,
    NULL,
    NULL,
    NULL,
    &def1trail
};

See struct x1f4_2ndscope_type.

The flags field says the operator is a ternary (X1f4_E4_RAIL_MARK) only (X1f4_E4_RAIL_ONLY) one.

See Operator Second Extension Scope Flags.

Its rail field introduces the trailing operator definition:

const struct x1f4_operator_type def1trail = {
    "~",
    NULL,
    0224,
    X1f4_E4_REAL,
    real2,
    X1f4_E4_E2ND_LINK,
    1,
    NULL,
    &def1trail_ext
};

The flags field says the second extension is to be observed.

No function is introduced by the operator, as one is to be introduced by the definition second extension:

const struct x1f4_2ndscope_type def1trail_ext = {
    0,
    &def1line,
    NULL,
    NULL,
    NULL
};

The line field introduces the evaluating function, in the struct x1f4_linetext_type definition:

const struct x1f4_linetext_type def1line = {
    {	"def1",
	def1function,
	X1f4_E4_REAL,
	real3,
	3,
	0,
	4		},
    NULL
};

See struct x1f4_linetext_type.

The name and length fields are not interpreted when parsing or evaluating expressions, but may be when printing them.

The function field introduces the actual evaluating function:

int
def1function(void *output, void **input)
{
    X1f4_E4_REAL a, b, c, *out;

    a = *(X1f4_E4_REAL *) input[0];
    b = *(X1f4_E4_REAL *) input[1];

    out = output;
    *out = a * pow(b, c);

    return 0;
}

The args fields in the above definitions are:

int real2[] = { X1f4_E4_REAL, X1f4_E4_REAL };

and:

int real3[] = { X1f4_E4_REAL, X1f4_E4_REAL, X1f4_E4_REAL };