Write interface for new serialization system

contrib/epee/include/serialization/wire/fwd.h

@@ -0,0 +1,103 @@
+// Copyright (c) 2021-2023, The Monero Project
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <type_traits>
+
+//! Declare an enum to be serialized as an integer
+#define WIRE_AS_INTEGER(type_)                                          \
+  static_assert(std::is_enum<type_>(), "AS_INTEGER only enum types");   \
+  template<typename R>                                                  \
+  inline void read_bytes(R& source, type_& dest)                        \
+  {                                                                     \
+    std::underlying_type<type_>::type temp{};                           \
+    read_bytes(source, temp);                                           \
+    dest = type_(temp);                                                 \
+  }                                                                     \
+  template<typename W>                                                  \
+  inline void write_bytes(W& dest, const type_ source)                  \
+  { write_bytes(dest, std::underlying_type<type_>::type(source)); }
+
+//! Declare functions that list fields in `type` (using virtual interface)
+#define WIRE_DECLARE_OBJECT(type)                       \
+  void read_bytes(::wire::reader&, type&);              \
+  void write_bytes(::wire::writer&, const type&)
+
+//! Cast readers to `rtype` and writers to `wtype` before code expansion
+#define WIRE_BEGIN_MAP_BASE(rtype, wtype)				\
+  template<typename R>                                                  \
+  void read_bytes(R& source)                                            \
+  { wire_map(std::true_type{}, static_cast<rtype&>(source), *this); }	\
+                                                                        \
+  template<typename W>                                                  \
+  void write_bytes(W& dest) const                                       \
+  { wire_map(std::false_type{}, static_cast<wtype&>(dest), *this); }	\
+                                                                        \
+  template<typename B, typename F, typename T>                          \
+  static void wire_map(const B is_read, F& format, T& self)             \
+  { ::wire::object_fwd(is_read, format
+  
+/*! Define `read_bytes`, and `write_bytes` for `this` that forward the
+  derived format types for max performance. */
+#define WIRE_BEGIN_MAP()			\
+  WIRE_BEGIN_MAP_BASE(R, W)
+
+/*! Define `read_bytes`, and `write_bytes` for `this` that forward base format
+  types to reduce code expansion and executable size. */
+#define WIRE_BEGIN_MAP_ASM_SIZE()			\
+  WIRE_BEGIN_MAP_BASE(::wire::reader, ::wire::writer)
+
+//! End object map; omit last `,`
+#define WIRE_END_MAP() );}
+
+namespace wire
+{
+  struct basic_value;
+  class reader;
+  struct writer;
+
+  // defined in `wire/read.h`
+  template<typename R, typename... T>
+  void object_fwd(std::true_type is_read, R& source, T&&... fields);
+
+  // defined in `wire/write.h`
+  template<typename W, typename... T>
+  void object_fwd(std::false_type is_read, W& dest, T... fields);
+}
+namespace wire_read
+{
+  // defined in `wire/read.h`
+  template<typename R, typename T>
+  void bytes(R& source, T&& dest);
+}
+namespace wire_write
+{
+  // defined in `wire/write.h`
+  template<typename W, typename T>
+  void bytes(W& dest, const T& source);
+}