factorial.cpp
1.45 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
#include <poincare/factorial.h>
#include "layout/string_layout.h"
#include "layout/horizontal_layout.h"
extern "C" {
#include <assert.h>
}
#include <cmath>
namespace Poincare {
Factorial::Factorial(Expression * argument, bool clone) :
Function("fact")
{
setArgument(&argument, 1, clone);
}
Expression::Type Factorial::type() const {
return Type::Factorial;
}
Expression * Factorial::cloneWithDifferentOperands(Expression** newOperands,
int numberOfOperands, bool cloneOperands) const {
assert(newOperands != nullptr);
Factorial * f = new Factorial(newOperands[0], cloneOperands);
return f;
}
template<typename T>
Complex<T> Factorial::templatedComputeComplex(const Complex<T> c) const {
T n = c.a();
if (c.b() != 0 || std::isnan(n) || n != (int)n || n < 0) {
return Complex<T>::Float(NAN);
}
T result = 1;
for (int i = 1; i <= (int)n; i++) {
result *= (T)i;
if (std::isinf(result)) {
return Complex<T>::Float(result);
}
}
return Complex<T>::Float(std::round(result));
}
ExpressionLayout * Factorial::privateCreateLayout(FloatDisplayMode floatDisplayMode, ComplexFormat complexFormat) const {
assert(floatDisplayMode != FloatDisplayMode::Default);
assert(complexFormat != ComplexFormat::Default);
ExpressionLayout * childrenLayouts[2];
childrenLayouts[0] = m_args[0]->createLayout(floatDisplayMode, complexFormat);
childrenLayouts[1] = new StringLayout("!", 1);
return new HorizontalLayout(childrenLayouts, 2);
}
}