56 lines
989 B
C++
56 lines
989 B
C++
#include "grains.h"
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#include <limits>
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#include <stdexcept>
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namespace grains {
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using namespace std;
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namespace {
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static const index_t number_of_squares = 64;
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template <typename T>
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struct total_as_max
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{
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static inline T total()
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{
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return numeric_limits<T>::max();
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}
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};
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template <typename T>
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struct total_by_shift
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{
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static inline T total()
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{
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return T(1) << number_of_squares - 1;
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}
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};
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static_assert(number_of_squares <= numeric_limits<ulong_t>::digits,
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"grains::ulong_t is too small for grains::total");
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typedef conditional<number_of_squares == numeric_limits<ulong_t>::digits,
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total_as_max<ulong_t>,
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total_by_shift<ulong_t>>::type total_policy_t;
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}
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ulong_t square(index_t index)
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{
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if (index < 1 || index > number_of_squares)
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throw domain_error("invalid square number");
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return ulong_t(1) << (index - 1);
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}
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ulong_t total()
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{
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return total_policy_t::total();
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}
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}
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