panic.h

#pragma once

#include <concepts>
#include <format>
#include <source_location>
#include <string_view>
#include <type_traits>

namespace bbai::baser {
//--------------------------------------------------------------------------------------------------
// panic_dynamic_string_view
//--------------------------------------------------------------------------------------------------
struct panic_dynamic_string_view {
  template <class T>
    requires std::constructible_from<std::string_view, T>
  panic_dynamic_string_view(
      const T &s,
      std::source_location loc = std::source_location::current()) noexcept
      : s{s}, loc{loc} {}

  std::string_view s;
  std::source_location loc;
};

//--------------------------------------------------------------------------------------------------
// panic_format
//--------------------------------------------------------------------------------------------------
template <class... Args>
struct panic_format {
  template <class T>
  consteval panic_format(
      const T &s,
      std::source_location loc = std::source_location::current()) noexcept
      : fmt{s}, loc{loc} {}

  std::format_string<Args...> fmt;
  std::source_location loc;
};

//--------------------------------------------------------------------------------------------------
// panic_impl
//--------------------------------------------------------------------------------------------------
[[noreturn]] void panic_impl(const char* s) noexcept;

//--------------------------------------------------------------------------------------------------
// panic
//--------------------------------------------------------------------------------------------------
[[noreturn]] inline void panic(panic_dynamic_string_view s) noexcept {
  auto msg =
      std::format("{}:{} panic: {}\n", s.loc.file_name(), s.loc.line(), s.s);
  panic_impl(msg.c_str());
}

template <class... Args>
[[noreturn]] void panic(panic_format<std::type_identity_t<Args>...> fmt,
                        Args &&...args) noexcept
  requires (sizeof ...(Args) > 0)
{
  auto msg = std::format("{}:{} panic: {}\n", fmt.loc.file_name(), fmt.loc.line(),
                         std::format(fmt.fmt, std::forward<Args>(args)...));
  panic_impl(msg.c_str());
}
} // namespace bbai::baser

namespace bbai {
using bbai::baser::panic;
} // namespace bbai