numbers.h

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#ifndef UTILS_NUMBERS_H
#define UTILS_NUMBERS_H
 
#include <limits>
#include <type_traits>
#include <cstdint>
 
#include <absl/strings/numbers.h>
#include <absl/strings/string_view.h>
 
namespace taco {
 
namespace utils_numbers_impl {
 
template<class IntType, class = void>
struct SimpleAtoiWrapperImpl{
    static inline bool call(absl::string_view str, IntType *out) {
        return absl::SimpleAtoi(str, out);
    }
};
 
template<class IntType>
struct SimpleAtoiWrapperImpl<IntType,
    typename std::enable_if<sizeof(IntType) <= 2>::type> {
 
    // keep in sync with the signed-ness check in absl
    typedef typename std::conditional<
        (IntType)(1) - (IntType)(2) < 0,
        std::int32_t,
        std::uint32_t>::type int32;
 
    static inline bool call(absl::string_view str, IntType *out) {
        int32 int32_out;
        if (!absl::SimpleAtoi(str, &int32_out)) {
            return false;
        }
 
        if (int32_out < std::numeric_limits<IntType>::min())
            return false;
        if (int32_out > std::numeric_limits<IntType>::max())
            return false;
        *out = (IntType) int32_out;
        return true;
    }
};
 
}   // namespace utils_numbers_impl
 
template<class IntType>
inline bool SimpleAtoiWrapper(absl::string_view str, IntType *out) {
    return utils_numbers_impl::SimpleAtoiWrapperImpl<IntType>::call(str, out);
}
 
 
}   // namespace taco
 
#endif // UTILS_NUMBERS_H