ghtz08

namespace details {

template <size_t fmt_len, typename... Args>
struct format_to_h;
template <size_t fmt_len, typename Arg, typename... Args>
struct format_to_h<fmt_len, Arg, Args...> {
    auto operator()(std::ostream & out, char const (&fmt)[fmt_len], size_t fmt_start, Arg && arg, Args && ... args) -> void {
        auto const braces = std::strstr(&fmt[fmt_start], "{}");
        if (braces == nullptr) {
            format_to_h<fmt_len>()(out, fmt, fmt_start);

ghtz08

#define let auto const

class Ipv4 {
  public:
    using Value = std::array<uint8_t, 4>;
    static constexpr auto ipv4_str_max_size = 3 + 1 + 3 + 1 + 3 + 1 + 3 + 1;

  public:
    explicit Ipv4(char const * ipv4, bool strict = false):
        Ipv4(ipv4, -1, strict) {}

ghtz08

#include <memory>
#include <stdexcept>
#include <string>
#include <string>
#include <tuple>
#include <type_traits>
#include <unordered_map>

#define let auto const
// 约束