[Issue 5866] New: std.math.sin(float), std.math.cos(float) to return float
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Wed Apr 20 04:11:56 PDT 2011
http://d.puremagic.com/issues/show_bug.cgi?id=5866
Summary: std.math.sin(float), std.math.cos(float) to return
float
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Keywords: wrong-code
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: nobody at puremagic.com
ReportedBy: bearophile_hugs at eml.cc
--- Comment #0 from bearophile_hugs at eml.cc 2011-04-20 04:08:20 PDT ---
Currently (DMD 2.052) std.math doesn't seem to use the cosf, sinf C functions,
but it seems to use sqrtf (or something similar):
import std.math: sqrt, sin, cos;
import core.stdc.math: sqrtf, sinf, cosf;
void main() {
float x = 1.0f;
// C functions
static assert(is(typeof( sqrtf(x) ) == float)); // OK
static assert(is(typeof( sinf(x) ) == float)); // OK
static assert(is(typeof( cosf(x) ) == float)); // OK
// D functions
static assert(is(typeof( sqrt(x) ) == float)); // OK
static assert(is(typeof( sin(x) ) == float)); // ERR
static assert(is(typeof( cos(x) ) == float)); // ERR
}
I'd like std.math.sin/cos to return a float value when the input argument is a
float.
This is useful if you want to perform operations on floats and keep
intermediate expressions (that call sin/cos) as floats:
enum float PI_FLOAT = 3.14159265358979323846264f; // not present in std.math
float x = 0.3f;
float y = 2.0f * PI_FLOAT * sin(x); // contains no double->float conversions
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