[linux-audio-dev] LADSPA: unions vs pointers .. more issues

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Subject: [linux-audio-dev] LADSPA: unions vs pointers .. more issues
From: Benno Senoner (sbenno_AT_gardena.net)
Date: Sat Mar 25 2000 - 20:07:42 EET

Hi,
just another thought about unions:

when using the union example:
typedef union {
                       float float32;
                       double float64;
                        .. (insert your foobar datatype <=16bytes here)
                       char pad[16];
                     } LADSPA_Data;

if you access to a value
with

variable.float32 = 123

and you want to turn your plugin code from float32 to float64
you have to change all types from .float32 to float64

while in the pointer case 

---
float *float_ptr;
float_ptr=(float *)&psPortRangeHints[SDL_DELAY_LENGTH].HintDescriptor
* float_ptr  = LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE;
---

you only have to typedef use typedefs ( typedef float float_type) instead of 
using the float datatype directy.
So with a simple change of the typedef you have the 64bit-float plugin.

Anyway I don't see the substition of float32 to float64 as a big deal,
since unions make the code much simpler, and the performance is not compromised.
My first version will therefore use the union construct.

Benno.

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