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| #include <bits/stdc++.h>
class length
{
private:
double value;
public:
enum unit
{
meter,
kilometer,
millimeter,
centimeter,
inch,
foot,
yard,
mile
};
static constexpr double factors[] = {
1.0, 1000.0, 1e-3, 1e-2, 0.0254, 0.3048, 0.9144, 1609.344
};
explicit length(double v, unit u = meter)
{
value = v * factors[u];
}
friend length operator+(length lhs, length rhs)
{
return length(lhs.value + rhs.value);
}
double get() const noexcept { return value; }
};
length operator "" _m(long double v)
{
return length(v, length::meter);
}
length operator "" _cm(long double v)
{
return length(v, length::centimeter);
}
int main()
{
std::ios::sync_with_stdio(false);
std::cin.tie(0);
std::cout << (1.0_m + 10.0_cm).get() << std::endl;
return 0;
}
|
