Subject:
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GNU C wizards?
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 4 Jan 1999 05:20:46 GMT
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Original-From:
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dave madden <[dhm@paradigm.webvision]spamcake[.com]>
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Viewed:
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1178 times
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Are there any GNU C/C++ wizards out there? I'm trying to write an
asm() statement to describe the H8's bclr/bset instructions. I have a
wicked sweet tooth for C++ syntactic sugar, and I'd like to be able to
say (for example):
Port6.Bit3 = true;
and have it turn into:
bset #3,@0xbb:8
[Actually, I'd *really* like to say: "Port6[3] = true;" but after
beating my head against the compiler for an hour or two, I don't think
it's going to happen.]
I'm making some headway with templates for Ports and Bits:
template <int DR, int DDR> Port {
public:
template <int N> Bit {
public:
Bit &operator=( bool b ) {
if (b)
asm( "bset..." );
else
asm( "bclr..." );
return *this;
}
} ;
Bit<0> Bit0;
// ...
Bit<7> Bit7;
} ;
but I can't get the constraints for the two asm() statements quite
right. Can anybody help?
Thanks,
d.
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: GNU C wizards?
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| (...) Actually, you can do that -- look at the STL implementation for BitVector<bool>. (...) This is similar to the STL implementation using a helper class for the assignments. All you need to do is pass a reference to the port object into the bit (...) (26 years ago, 4-Jan-99, to lugnet.robotics)
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