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overloaded functions and pointer-conversion query
#338926
08/22/10 19:34
08/22/10 19:34
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Joined: Feb 2008
Posts: 3,232
Australia
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Hi all.
Question 1> I believe the lite-c does some form of auto-object-to-pointer
conversion when dealing with NON-overloaded functions.
ie. func(my.x); --> void func(VECTOR* pos) conversion.
Can someone please explain the 'steps' this conversion follows
in deciding whether to convert, and what to convert to, etc.
Question 2> I believe this auto-conversion DOESNT apply when dealing with OVERLOADED functions.
Is it "theoretically" possible for the engine to be upgraded to auto-convert overloaded functions too?
If not, why not?
Thanks guys.
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: overloaded functions and pointer-conversion query
[Re: EvilSOB]
#338930
08/22/10 19:52
08/22/10 19:52
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Joined: Feb 2006
Posts: 1,011
Germany
pegamode
Serious User
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Serious User
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Posts: 1,011
Germany
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As far as I know auto-conversion should apply also with overloaded functions, but there was a long time bug using strings in overloaded functions, but it was fixed in 7.83.2: Overloaded functions weren't found by the compiler when the function prototype expected a STRING* argument, but was called with a char* or char[] constant (all A7 versions; fixed in 7.83.6). Workaround: Define the overloaded prototype with a char* parameter.
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Re: overloaded functions and pointer-conversion query
[Re: pegamode]
#338932
08/22/10 20:06
08/22/10 20:06
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Posts: 3,232
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When calling overloaded functions, make sure that argument types exactly match one of the defined functions. The automatic type conversion and pointer detection of the lite-C compiler does not happen here. That means you must really use the C++ & operator for pointers. And for me it is mostly the VECTOR* that give me problems. There are so many ways to call it... example: this code works fine...
void funcA(VECTOR* pos)
{ ... }
void funcB(VECTOR* pos, int height)
{ ... }
action play()
{
funcA(my.x);
funcB(my.x, 1);
}
But this will fail on compile
void func(VECTOR* pos)
{ ... }
void func(VECTOR* pos, int height)
{ ... }
action play()
{
func(my.x);
func(my.x, 1);
}
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: overloaded functions and pointer-conversion query
[Re: Lukas]
#338935
08/22/10 20:21
08/22/10 20:21
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Posts: 3,232
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Yeah Lukas, that will "work"...
But with UN-overloaded it works fine without re-casting.
Thats what Im asking about, the AUTO conversions...
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: overloaded functions and pointer-conversion query
[Re: jcl]
#340642
09/06/10 10:02
09/06/10 10:02
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Posts: 3,232
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OK, thanks. I suspected as much.
So overloaded functions cant do what I wnt in "this" instance.
Thanks anyway...
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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