portability.h

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/**************************************************************************/ /**
 * @brief Library portability helper definitions.
 * @file
 ******************************************************************************/
 
#pragma once
 
#include <cstdint>
 
// References:
// - https://gcc.gnu.org/wiki/Visibility.
// - https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/port_def.inc
#if defined(_WIN32) || defined(_MSC_VER) || defined(__CYGWIN__)
#  ifdef BUILDING_DLL
#    ifdef __GNUC__
#      define P1_EXPORT __attribute__((dllexport))
#    else
#      define P1_EXPORT __declspec(dllexport)
#    endif
#  else
#    ifdef __GNUC__
#      define P1_EXPORT __attribute__((dllimport))
#    else
#      define P1_EXPORT __declspec(dllimport)
#    endif
#  endif
#  define P1_HIDDEN
#else
#  if __GNUC__ >= 4
#    define P1_EXPORT __attribute__((visibility("default")))
#    define P1_HIDDEN __attribute__((visibility("hidden")))
#  else
#    define P1_EXPORT
#    define P1_HIDDEN
#  endif
#endif
 
// ssize_t is a POSIX extension and is not supported on Windows.
#if defined(_WIN32)
typedef int32_t p1_ssize_t;
#elif defined(_MSC_VER)
typedef int64_t p1_ssize_t;
#else
#  include <sys/types.h> // For ssize_t
typedef ssize_t p1_ssize_t;
#endif
 
// Support for multi-statement constexpr functions was not added until C++14.
// When compiling with C++11, we'll simply use inline instead.
#ifndef P1_HAVE_MULTILINE_CONSTEXPR_FUNC
#  define P1_HAVE_MULTILINE_CONSTEXPR_FUNC (__cplusplus >= 201402L)
#endif
 
#ifndef P1_CONSTEXPR_FUNC
#  if P1_HAVE_MULTILINE_CONSTEXPR_FUNC
#    define P1_CONSTEXPR_FUNC constexpr
#  else
#    define P1_CONSTEXPR_FUNC inline
#  endif
#endif