Display the source code in std/numeric.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Alias `std.numeric.CustomFloat`

Allows user code to define custom floating-point formats. These formats are for storage only; all operations on them are performed by first implicitly extracting them to real first. After the operation is completed the result can be stored in a custom floating-point value via assignment.


						
				alias CustomFloat(uint bits)
				 = CustomFloat!(CustomFloatParams!bits);
						
						
				alias CustomFloat(uint precision, uint exponentWidth, CustomFloatFlags flags = CustomFloatFlags.ieee)
				 = CustomFloat!(CustomFloatParams!(precision,exponentWidth,flags));
						
						
				struct CustomFloat(uint precision, uint exponentWidth, CustomFloatFlags flags, uint bias)
				

				  
				

				if (((flags & flags.signed) + precision + exponentWidth) % 8 == 0 && (precision + exponentWidth > 0));

Alias CustomFloat

Struct CustomFloat

Constructors

Name	Description
`this`	Initialize from any `real` compatible type.

Properties

Name	Type	Description
`dig`[get]	`size_t`
`epsilon`[get]	`CustomFloat`
`get`[get]	`F`	Fetches the stored value either as a `float`, `double` or `real`.
`im`[get]	`CustomFloat`
`infinity`[get]	`CustomFloat`
`max`[get]	`CustomFloat`
`max_10_exp`[get]	`int`
`min_10_exp`[get]	`int`
`min_normal`[get]	`CustomFloat`
`nan`[get]	`CustomFloat`
`re`[get]	`CustomFloat`

Methods

Name	Description
`opAssign`	Self assignment
`opAssign`	Assigns from any `real` compatible type.
`opBinary`	Convert the CustomFloat to a real and perform the relevant operator on the result
`opBinaryRight`	Convert the CustomFloat to a real and perform the relevant operator on the result
`opCmp`	Convert the CustomFloat to a real and perform the relevant operator on the result
`opOpAssign`	Convert the CustomFloat to a real and perform the relevant operator on the result
`opUnary`	Convert the CustomFloat to a real and perform the relevant operator on the result

Aliases

Name	Description
`opCast`	Fetches the stored value either as a `float`, `double` or `real`.

Templates

Name	Description
`toString`	Convert the CustomFloat to a real and perform the relevant operator on the result

Example

import std.math : sin, cos;

// Define a 16-bit floating point values
CustomFloat!16                                x;     // Using the number of bits
CustomFloat!(10, 5)                           y;     // Using the precision and exponent width
CustomFloat!(10, 5,CustomFloatFlags.ieee)     z;     // Using the precision, exponent width and format flags
CustomFloat!(10, 5,CustomFloatFlags.ieee, 15) w;     // Using the precision, exponent width, format flags and exponent offset bias

// Use the 16-bit floats mostly like normal numbers
w = x*y - 1;

// Functions calls require conversion
z = sin(+x)           + cos(+y);                     // Use unary plus to concisely convert to a real
z = sin(x.get!float)  + cos(y.get!float);            // Or use get!T
z = sin(cast(float) x) + cos(cast(float) y);           // Or use cast(T) to explicitly convert

// Define a 8-bit custom float for storing probabilities
alias Probability = CustomFloat!(4, 4, CustomFloatFlags.ieee^CustomFloatFlags.probability^CustomFloatFlags.signed );
auto p = Probability(0.5);

Authors

Andrei Alexandrescu, Don Clugston, Robert Jacques, Ilya Yaroshenko

License

Boost License 1.0.

API Documentation

Alias std.numeric.CustomFloat

Alias CustomFloat

Alias CustomFloat

Struct CustomFloat

Constructors

Properties

Methods

Aliases

Templates

Example

Authors

License

Alias `std.numeric.CustomFloat`