sbuf_sink.hpp

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#pragma once
#include <microfmt/microfmt.hpp>
 
namespace microfmt {
 
template <typename SBufT> class RELOCO_POINTER sbuf_sink {
public:
  explicit constexpr sbuf_sink(SBufT *sb RELOCO_LIFETIMEBOUND RELOCO_LIFETIME_CAPTURE_BY_THIS) noexcept : m_sbuf(sb) {}
 
  [[nodiscard]] sink as_sink() const noexcept RELOCO_LIFETIMEBOUND {
    return sink{.ctx = m_sbuf, .write_fn = [](void *ctx, microfmt::string_view sv) noexcept {
                  auto *self = static_cast<SBufT *>(ctx);
                  if (!sv.empty()) {
                    // ADL / deferred lookup will resolve sbuf_bcat at instantiation
                    // time if <sys/sbuf.h> is included by the user.
                    sbuf_bcat(self, sv.data(), sv.size());
                  }
                }};
  }
 
  [[nodiscard]] constexpr SBufT *native_handle() const noexcept { return m_sbuf; }
 
private:
  SBufT *m_sbuf;
};
 
} // namespace microfmt