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| template <int n, int a, int d>
struct sqrt_impl
{
enum
{
new_a = (a + (a + d)) / 2,
new_b = n / new_a,
max_ab = new_a > new_b ? new_a : new_b,
min_ab = new_a < new_b ? new_a : new_b,
value = sqrt_impl<n, min_ab, max_ab - min_ab>::value
};
};
template <int n, int x>
struct sqrt_impl<n, x, 0>
{
enum
{
value = x
};
};
template <int n, int x>
struct sqrt_impl<n, x, 1>
{
enum
{
value = x + 1
};
};
template <int n>
struct sqrt
{
enum
{
value = sqrt_impl<n, 0, n>::value
};
};
int main()
{
int x = sqrt<200>::value;
return 0;
} | |
