Vector products: Difference between revisions
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=={{header|D}}==
<lang d>import std.stdio, std.conv, std.numeric;
immutable struct V3 {
union {
static immutable struct { double x, y, z; }
immutable double[3] v;
}
double dot(in V3 rhs) /*@safe*/ const pure nothrow {
return dotProduct(v, rhs.v);
}
V3 cross(in V3 rhs) @safe const pure nothrow {
return V3(y * rhs.z - z * rhs.y,
z * rhs.x - x * rhs.z,
x * rhs.y - y * rhs.x);
}
string toString() /*@safe*/ const { return text(v); }
}
double scalarTriple(in V3 a, in V3 b, in V3 c)
/*@safe*/ pure nothrow {
return a.dot(b.cross(c));
}
V3 vectorTriple(in V3 a, in V3 b, in V3 c) @safe pure nothrow {
return a.cross(b.cross(c));
}
void main() {
immutable V3 a = {3, 4, 5},
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