windows/gflags/gflags_declare.h

// Copyright (c) 1999, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * 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.
//     * Neither the name of Google Inc. 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
// OWNER 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.

// ---
//
// Revamped and reorganized by Craig Silverstein
//
// This is the file that should be included by any file which declares
// command line flag.

#ifndef BASE_COMMANDLINEFLAGS_DECLARE_H_
#define BASE_COMMANDLINEFLAGS_DECLARE_H_

#include <string>
#if 0
#include <stdint.h>         // the normal place uint16_t is defined
#endif
#if 1
#include <sys/types.h>      // the normal place u_int16_t is defined
#endif
#if 0
#include <inttypes.h>       // a third place for uint16_t or u_int16_t
#endif

namespace google {
#if 0      // the C99 format
typedef int32_t int32;
typedef uint32_t uint32;
typedef int64_t int64;
typedef uint64_t uint64;
#elif 0   // the BSD format
typedef int32_t int32;
typedef u_int32_t uint32;
typedef int64_t int64;
typedef u_int64_t uint64;
#elif 1     // the windows (vc7) format
typedef __int32 int32;
typedef unsigned __int32 uint32;
typedef __int64 int64;
typedef unsigned __int64 uint64;
#else
#error Do not know how to define a 32-bit integer quantity on your system
#endif
}


#if defined(_MSC_VER) && !defined(GFLAGS_DLL_DECLARE_FLAG)
# define GFLAGS_DLL_DECLARE_FLAG  __declspec(dllimport)
#endif

namespace fLS {

// The meaning of "string" might be different between now and when the
// macros below get invoked (e.g., if someone is experimenting with
// other string implementations that get defined after this file is
// included).  Save the current meaning now and use it in the macros.
typedef std::string clstring;

}

#define DECLARE_VARIABLE(type, shorttype, name) \
  /* We always want to import declared variables, dll or no */ \
  namespace fL##shorttype { extern GFLAGS_DLL_DECLARE_FLAG type FLAGS_##name; } \
  using fL##shorttype::FLAGS_##name

#define DECLARE_bool(name) \
  DECLARE_VARIABLE(bool, B, name)

#define DECLARE_int32(name) \
  DECLARE_VARIABLE(::google::int32, I, name)

#define DECLARE_int64(name) \
  DECLARE_VARIABLE(::google::int64, I64, name)

#define DECLARE_uint64(name) \
  DECLARE_VARIABLE(::google::uint64, U64, name)

#define DECLARE_double(name) \
  DECLARE_VARIABLE(double, D, name)

#define DECLARE_string(name) \
  namespace fLS {                       \
  using ::fLS::clstring;                \
  extern GFLAGS_DLL_DECLARE_FLAG ::fLS::clstring& FLAGS_##name; \
  }                                     \
  using fLS::FLAGS_##name

#endif  // BASE_COMMANDLINEFLAGS_DECLARE_H_