c_string_span_sink.hpp

Go to the documentation of this file.

#pragma once
 
// std-interop-file: opt-in std::span constructor overload for interop with APIs that already speak <span>.
#include <microfmt/microfmt.hpp>
 
namespace microfmt {
 
class MICROFMT_API_CLASS RELOCO_POINTER c_string_span_sink : private detail::c_string_sink_base {
public:
  explicit constexpr c_string_span_sink(span<char> buf RELOCO_LIFETIMEBOUND RELOCO_LIFETIME_CAPTURE_BY_THIS) noexcept
      : detail::c_string_sink_base{buf.empty() ? nullptr : buf.data(), buf.empty() ? 0 : buf.size() - 1, 0} {
    if (m_data) {
      m_data[0] = '\0';
    }
  }
 
#if RELOCO_HAS_STD_SPAN
  template <std::size_t Extent>
  explicit constexpr c_string_span_sink(
      std::span<char, Extent> buf RELOCO_LIFETIMEBOUND RELOCO_LIFETIME_CAPTURE_BY_THIS) noexcept
      : detail::c_string_sink_base{buf.empty() ? nullptr : buf.data(), buf.empty() ? 0 : buf.size() - 1, 0} {
    if (m_data) {
      m_data[0] = '\0';
    }
  }
#endif
 
  [[nodiscard]] sink as_sink() noexcept RELOCO_LIFETIMEBOUND {
    return sink{this, &detail::c_string_sink_base::write_thunk};
  }
 
  [[nodiscard]] constexpr const char *c_str() const noexcept RELOCO_LIFETIMEBOUND { return m_data ? m_data : ""; }
 
  [[nodiscard]] constexpr microfmt::string_view view() const noexcept RELOCO_LIFETIMEBOUND {
    return microfmt::string_view(m_data, m_pos);
  }
 
  [[nodiscard]] constexpr std::size_t size() const noexcept { return m_pos; }
 
  [[nodiscard]] constexpr std::size_t max_size() const noexcept { return m_max_payload; }
 
  RELOCO_REINITIALIZES constexpr void reset() noexcept {
    m_pos = 0;
    if (m_data) {
      m_data[0] = '\0';
    }
  }
};
 
} // namespace microfmt