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header-pre.hxx
/* Compiler settings for compiling libpqxx headers, and workarounds for all.
*
* Include this before including any other libpqxx headers from within libpqxx.
* And to balance it out, also include header-post.hxx at the end of the batch
* of headers.
*
* The public libpqxx headers (e.g. `<pqxx/connection>`) include this already;
* there's no need to do this from within an application.
*
* Include this file at the highest aggregation level possible to avoid nesting
* and to keep things simple.
*
* Copyright (c) 2000-2024, Jeroen T. Vermeulen.
*
* See COPYING for copyright license. If you did not receive a file called
* COPYING with this source code, please notify the distributor of this
* mistake, or contact the author.
*/
#if __has_include(<version>)
# include <version>
#endif
// NO GUARD HERE! This part should be included every time this file is.
#if defined(_MSC_VER)
// Save compiler's warning state, and set warning level 4 for maximum
// sensitivity to warnings.
# pragma warning(push, 4)
// Visual C++ generates some entirely unreasonable warnings. Disable them.
// Copy constructor could not be generated.
# pragma warning(disable : 4511)
// Assignment operator could not be generated.
# pragma warning(disable : 4512)
// Can't expose outside classes without exporting them. Except the MSVC docs
// say please ignore the warning if it's a standard library class.
# pragma warning(disable : 4251)
// Can't derive library classes from outside classes without exporting them.
// Except the MSVC docs say please ignore the warning if the parent class is
// in the standard library.
# pragma warning(disable : 4275)
// Can't inherit from non-exported class.
# pragma warning(disable : 4275)
#endif // _MSC_VER
#if defined(PQXX_HEADER_PRE)
# error "Avoid nesting #include of pqxx/internal/header-pre.hxx."
#endif
#define PQXX_HEADER_PRE
// Workarounds & definitions that need to be included even in library's headers
#include "pqxx/config-public-compiler.h"
// MSVC has a nonstandard definition of __cplusplus.
#if defined(_MSC_VER)
# define PQXX_CPLUSPLUS _MSVC_LANG
#else
# define PQXX_CPLUSPLUS __cplusplus
#endif
// C++20: No longer needed.
// Enable ISO-646 alternative operaotr representations: "and" instead of "&&"
// etc. on older compilers. C++20 removes this header.
#if PQXX_CPLUSPLUS <= 201703L && __has_include(<ciso646>)
# include <ciso646>
#endif
#if defined(PQXX_HAVE_GCC_PURE)
# define PQXX_PURE __attribute__((pure))
#else
# define PQXX_PURE /* pure */
#endif
#if defined(__GNUC__)
# define PQXX_COLD __attribute__((cold))
#else
# define PQXX_COLD /* cold */
#endif
// Workarounds for Windows
#ifdef _WIN32
/* For now, export DLL symbols if _DLL is defined. This is done automatically
* by the compiler when linking to the dynamic version of the runtime library,
* according to "gzh"
*/
# if defined(PQXX_SHARED) && !defined(PQXX_LIBEXPORT)
# define PQXX_LIBEXPORT __declspec(dllimport)
# endif // PQXX_SHARED && !PQXX_LIBEXPORT
// Workarounds for Microsoft Visual C++
# ifdef _MSC_VER
// Suppress vtables on abstract classes.
# define PQXX_NOVTABLE __declspec(novtable)
// Automatically link with the appropriate libpq (static or dynamic, debug or
// release). The default is to use the release DLL. Define PQXX_PQ_STATIC to
// link to a static version of libpq, and _DEBUG to link to a debug version.
// The two may be combined.
# if defined(PQXX_AUTOLINK)
# if defined(PQXX_PQ_STATIC)
# ifdef _DEBUG
# pragma comment(lib, "libpqd")
# else
# pragma comment(lib, "libpq")
# endif
# else
# ifdef _DEBUG
# pragma comment(lib, "libpqddll")
# else
# pragma comment(lib, "libpqdll")
# endif
# endif
# endif
// If we're not compiling libpqxx itself, automatically link with the
// appropriate libpqxx library. To link with the libpqxx DLL, define
// PQXX_SHARED; the default is to link with the static library. A static link
// is the recommended practice.
//
// The preprocessor macro PQXX_INTERNAL is used to detect whether we
// are compiling the libpqxx library itself. When you compile the library
// yourself using your own project file, make sure to include this macro.
# if defined(PQXX_AUTOLINK) && !defined(PQXX_INTERNAL)
# ifdef PQXX_SHARED
# ifdef _DEBUG
# pragma comment(lib, "libpqxxD")
# else
# pragma comment(lib, "libpqxx")
# endif
# else // !PQXX_SHARED
# ifdef _DEBUG
# pragma comment(lib, "libpqxx_staticD")
# else
# pragma comment(lib, "libpqxx_static")
# endif
# endif
# endif
# endif // _MSC_VER
#elif defined(PQXX_HAVE_GCC_VISIBILITY) // !_WIN32
# define PQXX_LIBEXPORT __attribute__((visibility("default")))
# define PQXX_PRIVATE __attribute__((visibility("hidden")))
#endif // PQXX_HAVE_GCC_VISIBILITY
#ifndef PQXX_LIBEXPORT
# define PQXX_LIBEXPORT /* libexport */
#endif
#ifndef PQXX_PRIVATE
# define PQXX_PRIVATE /* private */
#endif
#ifndef PQXX_NOVTABLE
# define PQXX_NOVTABLE /* novtable */
#endif
// C++20: Assume support.
#if defined(PQXX_HAVE_LIKELY)
# define PQXX_LIKELY [[likely]]
# define PQXX_UNLIKELY [[unlikely]]
#else
# define PQXX_LIKELY /* [[likely]] */
# define PQXX_UNLIKELY /* [[unlikely]] */
#endif
// C++23: Assume support.
#if defined(PQXX_HAVE_ASSUME)
# define PQXX_ASSUME(condition) [[assume(condition)]]
#else
# define PQXX_ASSUME(condition) while (false)
#endif