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#ifndef MYGRATE_HELPERS_H
#define MYGRATE_HELPERS_H
#include <boost/numeric/conversion/cast.hpp>
#include <concepts>
#include <cstdint>
#include <cstdlib>
#include <string>
#include <utility>
namespace MyGrate {
template<uint8_t size>
using SmallestUInt = std::conditional_t<size <= 8, uint8_t,
std::conditional_t<size <= 16, uint16_t, std::conditional_t<size <= 32, uint32_t, uint64_t>>>;
template<uint8_t size>
constexpr inline auto
bitslice(const std::integral auto i, uint8_t offset) -> SmallestUInt<size>
{
return (i >> offset) & ((1U << size) - 1U);
}
template<typename X, typename R, typename... P>
constexpr inline auto
verify(R expr, P &&... p)
{
if (!expr) [[unlikely]] {
throw X(std::forward<P>(p)...);
}
return expr;
}
constexpr inline auto
mod100_extract(std::integral auto & i)
{
using R = std::conditional_t<std::is_signed_v<decltype(i)>, int8_t, uint8_t>;
const auto r {boost::numeric_cast<R>(i % 100)};
i /= 100;
return r;
}
template<typename T>
concept Stringable = requires(T a)
{
{
std::to_string(a)
} -> std::same_as<std::string>;
};
template<typename T>
concept Viewable = requires(T a)
{
{
a.data()
} -> std::convertible_to<const char *>;
{
a.size()
} -> std::integral;
};
inline const char *
getenv(const char * env, const char * dfl)
{
if (const auto e {::getenv(env)}) {
return e;
}
return dfl;
}
}
#endif
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