Comments (4)
Hi @Klummel69, this is not possible at the moment, but it makes sense to be able to do that.
However, the point of fpm
is to be explicit about conversions that potentially throw away information so this functionality should be added as an explicit constructor so you can write:
fixed2 = fpm::fixed_16_16(fixed1);
from fpm.
Great, thanks for adding the feature. This increases the quality of the library.
I plan to store data types with different solutions.
- Angles: 8_24 format (-2 π … 2 π)
- Coordinates: 16_16 or 24_8 format.
This keeps angle calculations more accurate. Only after trigonometric calculations the resolution is reduced.
Example:
fpm::fixed_8_24 w {1.047197551};
fpm::fixed_16_16 x,y;
//w = w1+w2+w3;
x = 100 * fpm::fixed_16_16(fpm::sin(w));
y = 100 * fpm::fixed_16_16(fpm::cos(w));
A possibility of conversion without explicit construction would be good, but it is bearable.
from fpm.
A possibility of conversion without explicit construction would be good.
I understand the desire to have this, but it's generally a bad idea. The C++ Core Guidelines also discourage this: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#es46-avoid-lossy-narrowing-truncating-arithmetic-conversions
Hence the decision to have these kind of conversions explicit.
from fpm.
You got me. Actually, I try to follow the guideline. I had used template code that was not compliant with the guideline. In the meantime I have corrected that. Thanks.
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Related Issues (20)
- Conversion of max() and lowest() to float HOT 6
- Question about having to resort to floats for initialization. HOT 1
- Provide a way to serialize fpm::fixed HOT 2
- How to convert from fixed to float or int? HOT 1
- Avoid using floating point arithmetic to compute static_cast<double>(fpm::fixed_16_16) HOT 6
- Unable to compile when minwindef.h is (implicitly) included before fixed.hpp HOT 2
- Support for Shift Operators HOT 5
- std::numeric_limits<>::has_denorm shall be of type float_denorm_style, not bool
- Please allow to use the external libfixmath HOT 3
- Feature Proposal: optionally disable rounding HOT 3
- Support fraction-only unsigned numbers
- Cannot result in a constant expression errors HOT 1
- Is there a way to initialize a fpm value from the string expression of a float number? HOT 3
- std::numeric_limits<fp>::min() vs. lowest() HOT 2
- Use types larger than 32bit HOT 5
- Include a link in your docs to this GitHub HOT 1
- [feature request] include a sin() that accept degrees instead of radians HOT 3
- Docs bug? Signed vs Unsigned integer types HOT 1
- Docs: mention rounding mode(s)?
- Is Division of two fixed point numbers implemented? HOT 3
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