In povray.general we recently discussed implementing some limited type 
checking. Attached is an include files showing testing for two new 
keywords in the povr branch called id_type() and id_types_match().

Note. Though the id values often change from release to release I found 
an id_type() works in a switch statement making the id_type() worthwhile 
too, I thought.

//---
#include "id_types.inc"

Mcr_ID_type(ID_type_float)
Mcr_ID_type(ID_type_string)
Mcr_ID_type("Hello")

Mcr_ID_type_test()

#error "\nTesting. Stop early\n"
//---

An excerpt of the output follows showing the current povr values for 
certain types. Notably the parser treats some things we might think of 
as separate as the same internal ID.
---
float       = 27.0
string      = 527.0
vector2D    = 584.0
vector3D    = 71.0
vector4D    = 592.0
vector5D    = 95.0
dictionary  = 209.0
array       = 121.0
array_mixed = 121.0
sphere      = 390.0
box         = 390.0
object      = 390.0
merge       = 390.0
union       = 390.0
color       = 95.0
finish      = 247.0
normal      = 381.0
pigment     = 420.0
texture     = 542.0
---

Bill P.

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Attachments:
Download 'id_types.inc.txt' (5 KB)