chapter-1.cpp

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// ===-- chapter-1/chapter-1.cpp -------------------------- -*- C++ -*- --=== //
#include <stdio.h>
 
 
namespace chapter1 {
 
unsigned binary_func(unsigned long const N)
{
    return (N == 0) ? 0 : (N % 10) + (2 * binary_func(N/10));
}
 
template <unsigned long N>
struct binary
{
    static unsigned const value = (binary<N/10>::value * 2) + (N % 10);
};
 
template<>
struct binary<0>
{
    static unsigned const value = 0;
};
 
} // namespace chapter1
 
 
namespace {
using namespace chapter1;
 
struct test_result {
    unsigned const expected; unsigned const got;
} const run[] = {
    {.expected = 1, .got = binary<1>::value},
    {.expected = 3, .got = binary<11>::value},
    {.expected = 5, .got = binary<101>::value},
    {.expected = 7, .got = binary<111>::value},
    {.expected = 9, .got = binary<1001>::value},
};
 
} // namespace <anon>
 
int main()
{
    using namespace chapter1;
 
    for (size_t i = 0; i < sizeof(run) / sizeof(*run); ++i) {
        printf("Should be %u: %u\n", run[i].expected, run[i].got);
    }
    return 0;
}