ratio.h

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#pragma once

 
#include "fl/stl/int.h"
#include "fl/stl/static_assert.h"
 
namespace fl {

template<fl::i64 Num, fl::i64 Denom = 1>
struct ratio {
    FL_STATIC_ASSERT(Denom != 0, "ratio denominator cannot be zero");
 
    static constexpr fl::i64 num = Num;
    static constexpr fl::i64 den = Denom;
};

template<typename R1, typename R2>
using ratio_divide = ratio<
    R1::num * R2::den,
    R1::den * R2::num
>;

template<typename R1, typename R2>
using ratio_multiply = ratio<
    R1::num * R2::num,
    R1::den * R2::den
>;
 
// Common SI ratio types
using nano  = ratio<1, 1000000000>;     
using micro = ratio<1, 1000000>;         
using milli = ratio<1, 1000>;            
using centi = ratio<1, 100>;             
using deci  = ratio<1, 10>;              
using deca  = ratio<10, 1>;              
using hecto = ratio<100, 1>;             
using kilo  = ratio<1000, 1>;            
using mega  = ratio<1000000, 1>;         
using giga  = ratio<1000000000, 1>;      
 
} // namespace fl