436 lines
15 KiB
C++
436 lines
15 KiB
C++
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#ifndef _C4_ERROR_HPP_
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#define _C4_ERROR_HPP_
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/** @file error.hpp Facilities for error reporting and runtime assertions. */
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/** @defgroup error_checking Error checking */
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#include "c4/config.hpp"
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#ifdef _DOXYGEN_
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/** if this is defined and exceptions are enabled, then calls to C4_ERROR()
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* will throw an exception
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* @ingroup error_checking */
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# define C4_EXCEPTIONS_ENABLED
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/** if this is defined and exceptions are enabled, then calls to C4_ERROR()
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* will throw an exception
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* @see C4_EXCEPTIONS_ENABLED
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* @ingroup error_checking */
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# define C4_ERROR_THROWS_EXCEPTION
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/** evaluates to noexcept when C4_ERROR might be called and
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* exceptions are disabled. Otherwise, defaults to nothing.
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* @ingroup error_checking */
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# define C4_NOEXCEPT
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#endif // _DOXYGEN_
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#if defined(C4_EXCEPTIONS_ENABLED) && defined(C4_ERROR_THROWS_EXCEPTION)
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# define C4_NOEXCEPT
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#else
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# define C4_NOEXCEPT noexcept
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#endif
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namespace c4 {
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namespace detail {
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struct fail_type__ {};
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} // detail
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} // c4
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#define C4_STATIC_ERROR(dummy_type, errmsg) \
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static_assert(std::is_same<dummy_type, c4::detail::fail_type__>::value, errmsg)
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//-----------------------------------------------------------------------------
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#define C4_ASSERT_SAME_TYPE(ty1, ty2) \
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C4_STATIC_ASSERT(std::is_same<ty1 C4_COMMA_X ty2>::value)
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#define C4_ASSERT_DIFF_TYPE(ty1, ty2) \
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C4_STATIC_ASSERT( ! std::is_same<ty1 C4_COMMA_X ty2>::value)
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//-----------------------------------------------------------------------------
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#ifdef _DOXYGEN_
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/** utility macro that triggers a breakpoint when
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* the debugger is attached and NDEBUG is not defined.
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* @ingroup error_checking */
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# define C4_DEBUG_BREAK()
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#endif // _DOXYGEN_
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#if defined(NDEBUG) || defined(C4_NO_DEBUG_BREAK)
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# define C4_DEBUG_BREAK()
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#else
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# ifdef __clang__
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# pragma clang diagnostic push
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# if !defined(__APPLE_CC__)
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# if __clang_major__ >= 10
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# pragma clang diagnostic ignored "-Wgnu-inline-cpp-without-extern" // debugbreak/debugbreak.h:50:16: error: 'gnu_inline' attribute without 'extern' in C++ treated as externally available, this changed in Clang 10 [-Werror,-Wgnu-inline-cpp-without-extern]
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# endif
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# else
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# if __clang_major__ >= 13
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# pragma clang diagnostic ignored "-Wgnu-inline-cpp-without-extern" // debugbreak/debugbreak.h:50:16: error: 'gnu_inline' attribute without 'extern' in C++ treated as externally available, this changed in Clang 10 [-Werror,-Wgnu-inline-cpp-without-extern]
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# endif
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# endif
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# elif defined(__GNUC__)
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# endif
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# include <c4/ext/debugbreak/debugbreak.h>
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# define C4_DEBUG_BREAK() if(c4::is_debugger_attached()) { ::debug_break(); }
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# ifdef __clang__
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# pragma clang diagnostic pop
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# elif defined(__GNUC__)
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# endif
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#endif
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namespace c4 {
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C4CORE_EXPORT bool is_debugger_attached();
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} // namespace c4
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//-----------------------------------------------------------------------------
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#ifdef __clang__
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/* NOTE: using , ## __VA_ARGS__ to deal with zero-args calls to
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* variadic macros is not portable, but works in clang, gcc, msvc, icc.
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* clang requires switching off compiler warnings for pedantic mode.
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* @see http://stackoverflow.com/questions/32047685/variadic-macro-without-arguments */
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments" // warning: token pasting of ',' and __VA_ARGS__ is a GNU extension
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#elif defined(__GNUC__)
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/* GCC also issues a warning for zero-args calls to variadic macros.
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* This warning is switched on with -pedantic and apparently there is no
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* easy way to turn it off as with clang. But marking this as a system
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* header works.
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* @see https://gcc.gnu.org/onlinedocs/cpp/System-Headers.html
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* @see http://stackoverflow.com/questions/35587137/ */
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# pragma GCC system_header
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#endif
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//-----------------------------------------------------------------------------
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namespace c4 {
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typedef enum : uint32_t {
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/** when an error happens and the debugger is attached, call C4_DEBUG_BREAK().
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* Without effect otherwise. */
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ON_ERROR_DEBUGBREAK = 0x01 << 0,
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/** when an error happens log a message. */
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ON_ERROR_LOG = 0x01 << 1,
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/** when an error happens invoke a callback if it was set with
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* set_error_callback(). */
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ON_ERROR_CALLBACK = 0x01 << 2,
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/** when an error happens call std::terminate(). */
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ON_ERROR_ABORT = 0x01 << 3,
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/** when an error happens and exceptions are enabled throw an exception.
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* Without effect otherwise. */
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ON_ERROR_THROW = 0x01 << 4,
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/** the default flags. */
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ON_ERROR_DEFAULTS = ON_ERROR_DEBUGBREAK|ON_ERROR_LOG|ON_ERROR_CALLBACK|ON_ERROR_ABORT
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} ErrorFlags_e;
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using error_flags = uint32_t;
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C4CORE_EXPORT void set_error_flags(error_flags f);
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C4CORE_EXPORT error_flags get_error_flags();
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using error_callback_type = void (*)(const char* msg, size_t msg_size);
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C4CORE_EXPORT void set_error_callback(error_callback_type cb);
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C4CORE_EXPORT error_callback_type get_error_callback();
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//-----------------------------------------------------------------------------
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/** RAII class controling the error settings inside a scope. */
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struct ScopedErrorSettings
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{
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error_flags m_flags;
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error_callback_type m_callback;
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explicit ScopedErrorSettings(error_callback_type cb)
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: m_flags(get_error_flags()),
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m_callback(get_error_callback())
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{
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set_error_callback(cb);
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}
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explicit ScopedErrorSettings(error_flags flags)
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: m_flags(get_error_flags()),
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m_callback(get_error_callback())
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{
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set_error_flags(flags);
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}
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explicit ScopedErrorSettings(error_flags flags, error_callback_type cb)
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: m_flags(get_error_flags()),
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m_callback(get_error_callback())
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{
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set_error_flags(flags);
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set_error_callback(cb);
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}
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~ScopedErrorSettings()
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{
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set_error_flags(m_flags);
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set_error_callback(m_callback);
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}
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};
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//-----------------------------------------------------------------------------
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/** source location */
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struct srcloc;
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C4CORE_EXPORT void handle_error(srcloc s, const char *fmt, ...);
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C4CORE_EXPORT void handle_warning(srcloc s, const char *fmt, ...);
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# define C4_ERROR(msg, ...) \
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do { \
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if(c4::get_error_flags() & c4::ON_ERROR_DEBUGBREAK) \
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{ \
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C4_DEBUG_BREAK() \
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} \
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c4::handle_error(C4_SRCLOC(), msg, ## __VA_ARGS__); \
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} while(0)
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# define C4_WARNING(msg, ...) \
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c4::handle_warning(C4_SRCLOC(), msg, ## __VA_ARGS__)
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#if defined(C4_ERROR_SHOWS_FILELINE) && defined(C4_ERROR_SHOWS_FUNC)
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struct srcloc
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{
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const char *file = "";
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const char *func = "";
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int line = 0;
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};
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#define C4_SRCLOC() c4::srcloc{__FILE__, C4_PRETTY_FUNC, __LINE__}
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#elif defined(C4_ERROR_SHOWS_FILELINE)
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struct srcloc
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{
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const char *file;
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int line;
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};
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#define C4_SRCLOC() c4::srcloc{__FILE__, __LINE__}
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#elif ! defined(C4_ERROR_SHOWS_FUNC)
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struct srcloc
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{
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};
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#define C4_SRCLOC() c4::srcloc()
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#else
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# error not implemented
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#endif
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//-----------------------------------------------------------------------------
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// assertions
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// Doxygen needs this so that only one definition counts
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#ifdef _DOXYGEN_
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/** Explicitly enables assertions, independently of NDEBUG status.
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* This is meant to allow enabling assertions even when NDEBUG is defined.
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* Defaults to undefined.
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* @ingroup error_checking */
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# define C4_USE_ASSERT
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/** assert that a condition is true; this is turned off when NDEBUG
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* is defined and C4_USE_ASSERT is not true.
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* @ingroup error_checking */
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# define C4_ASSERT
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/** same as C4_ASSERT(), additionally prints a printf-formatted message
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* @ingroup error_checking */
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# define C4_ASSERT_MSG
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/** evaluates to C4_NOEXCEPT when C4_XASSERT is disabled; otherwise, defaults
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* to noexcept
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* @ingroup error_checking */
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# define C4_NOEXCEPT_A
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#endif // _DOXYGEN_
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#ifndef C4_USE_ASSERT
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# ifdef NDEBUG
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# define C4_USE_ASSERT 0
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# else
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# define C4_USE_ASSERT 1
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# endif
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#endif
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#if C4_USE_ASSERT
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# define C4_ASSERT(cond) C4_CHECK(cond)
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# define C4_ASSERT_MSG(cond, /*fmt, */...) C4_CHECK_MSG(cond, ## __VA_ARGS__)
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# define C4_ASSERT_IF(predicate, cond) if(predicate) { C4_ASSERT(cond); }
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# define C4_NOEXCEPT_A C4_NOEXCEPT
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#else
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# define C4_ASSERT(cond)
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# define C4_ASSERT_MSG(cond, /*fmt, */...)
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# define C4_ASSERT_IF(predicate, cond)
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# define C4_NOEXCEPT_A noexcept
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#endif
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//-----------------------------------------------------------------------------
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// extreme assertions
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// Doxygen needs this so that only one definition counts
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#ifdef _DOXYGEN_
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/** Explicitly enables extreme assertions; this is meant to allow enabling
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* assertions even when NDEBUG is defined. Defaults to undefined.
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* @ingroup error_checking */
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# define C4_USE_XASSERT
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/** extreme assertion: can be switched off independently of
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* the regular assertion; use for example for bounds checking in hot code.
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* Turned on only when C4_USE_XASSERT is defined
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* @ingroup error_checking */
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# define C4_XASSERT
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/** same as C4_XASSERT(), and additionally prints a printf-formatted message
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* @ingroup error_checking */
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# define C4_XASSERT_MSG
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/** evaluates to C4_NOEXCEPT when C4_XASSERT is disabled; otherwise, defaults to noexcept
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* @ingroup error_checking */
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# define C4_NOEXCEPT_X
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#endif // _DOXYGEN_
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#ifndef C4_USE_XASSERT
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# define C4_USE_XASSERT C4_USE_ASSERT
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#endif
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#if C4_USE_XASSERT
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# define C4_XASSERT(cond) C4_CHECK(cond)
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# define C4_XASSERT_MSG(cond, /*fmt, */...) C4_CHECK_MSG(cond, ## __VA_ARGS__)
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# define C4_XASSERT_IF(predicate, cond) if(predicate) { C4_XASSERT(cond); }
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# define C4_NOEXCEPT_X C4_NOEXCEPT
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#else
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# define C4_XASSERT(cond)
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# define C4_XASSERT_MSG(cond, /*fmt, */...)
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# define C4_XASSERT_IF(predicate, cond)
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# define C4_NOEXCEPT_X noexcept
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#endif
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//-----------------------------------------------------------------------------
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// checks: never switched-off
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/** Check that a condition is true, or raise an error when not
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* true. Unlike C4_ASSERT(), this check is not disabled in non-debug
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* builds.
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* @see C4_ASSERT
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* @ingroup error_checking
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*
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* @todo add constexpr-compatible compile-time assert:
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* https://akrzemi1.wordpress.com/2017/05/18/asserts-in-constexpr-functions/
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*/
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#define C4_CHECK(cond) \
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do { \
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if(C4_UNLIKELY(!(cond))) \
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{ \
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C4_ERROR("check failed: %s", #cond); \
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} \
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} while(0)
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/** like C4_CHECK(), and additionally log a printf-style message.
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* @see C4_CHECK
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* @ingroup error_checking */
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#define C4_CHECK_MSG(cond, fmt, ...) \
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do { \
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if(C4_UNLIKELY(!(cond))) \
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{ \
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C4_ERROR("check failed: " #cond "\n" fmt, ## __VA_ARGS__); \
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} \
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} while(0)
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//-----------------------------------------------------------------------------
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// Common error conditions
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#define C4_NOT_IMPLEMENTED() C4_ERROR("NOT IMPLEMENTED")
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#define C4_NOT_IMPLEMENTED_MSG(/*msg, */...) C4_ERROR("NOT IMPLEMENTED: " __VA_ARGS__)
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#define C4_NOT_IMPLEMENTED_IF(condition) do { if(C4_UNLIKELY(condition)) { C4_ERROR("NOT IMPLEMENTED"); } } while(0)
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#define C4_NOT_IMPLEMENTED_IF_MSG(condition, /*msg, */...) do { if(C4_UNLIKELY(condition)) { C4_ERROR("NOT IMPLEMENTED: " __VA_ARGS__); } } while(0)
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#define C4_NEVER_REACH() do { C4_ERROR("never reach this point"); C4_UNREACHABLE(); } while(0)
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#define C4_NEVER_REACH_MSG(/*msg, */...) do { C4_ERROR("never reach this point: " __VA_ARGS__); C4_UNREACHABLE(); } while(0)
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//-----------------------------------------------------------------------------
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// helpers for warning suppression
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// idea adapted from https://github.com/onqtam/doctest/
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// TODO: add C4_MESSAGE() https://stackoverflow.com/questions/18252351/custom-preprocessor-macro-for-a-conditional-pragma-message-xxx?rq=1
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#ifdef C4_MSVC
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#define C4_SUPPRESS_WARNING_MSVC_PUSH __pragma(warning(push))
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#define C4_SUPPRESS_WARNING_MSVC(w) __pragma(warning(disable : w))
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#define C4_SUPPRESS_WARNING_MSVC_POP __pragma(warning(pop))
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#else // C4_MSVC
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#define C4_SUPPRESS_WARNING_MSVC_PUSH
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#define C4_SUPPRESS_WARNING_MSVC(w)
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#define C4_SUPPRESS_WARNING_MSVC_POP
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#endif // C4_MSVC
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#ifdef C4_CLANG
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#define C4_PRAGMA_TO_STR(x) _Pragma(#x)
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#define C4_SUPPRESS_WARNING_CLANG_PUSH _Pragma("clang diagnostic push")
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#define C4_SUPPRESS_WARNING_CLANG(w) C4_PRAGMA_TO_STR(clang diagnostic ignored w)
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#define C4_SUPPRESS_WARNING_CLANG_POP _Pragma("clang diagnostic pop")
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#else // C4_CLANG
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#define C4_SUPPRESS_WARNING_CLANG_PUSH
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#define C4_SUPPRESS_WARNING_CLANG(w)
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#define C4_SUPPRESS_WARNING_CLANG_POP
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#endif // C4_CLANG
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#ifdef C4_GCC
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#define C4_PRAGMA_TO_STR(x) _Pragma(#x)
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#define C4_SUPPRESS_WARNING_GCC_PUSH _Pragma("GCC diagnostic push")
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#define C4_SUPPRESS_WARNING_GCC(w) C4_PRAGMA_TO_STR(GCC diagnostic ignored w)
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#define C4_SUPPRESS_WARNING_GCC_POP _Pragma("GCC diagnostic pop")
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#else // C4_GCC
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#define C4_SUPPRESS_WARNING_GCC_PUSH
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#define C4_SUPPRESS_WARNING_GCC(w)
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#define C4_SUPPRESS_WARNING_GCC_POP
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#endif // C4_GCC
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#define C4_SUPPRESS_WARNING_MSVC_WITH_PUSH(w) \
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C4_SUPPRESS_WARNING_MSVC_PUSH \
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C4_SUPPRESS_WARNING_MSVC(w)
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#define C4_SUPPRESS_WARNING_CLANG_WITH_PUSH(w) \
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C4_SUPPRESS_WARNING_CLANG_PUSH \
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C4_SUPPRESS_WARNING_CLANG(w)
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#define C4_SUPPRESS_WARNING_GCC_WITH_PUSH(w) \
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C4_SUPPRESS_WARNING_GCC_PUSH \
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C4_SUPPRESS_WARNING_GCC(w)
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#define C4_SUPPRESS_WARNING_GCC_CLANG_PUSH \
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C4_SUPPRESS_WARNING_GCC_PUSH \
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C4_SUPPRESS_WARNING_CLANG_PUSH
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#define C4_SUPPRESS_WARNING_GCC_CLANG(w) \
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C4_SUPPRESS_WARNING_GCC(w) \
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C4_SUPPRESS_WARNING_CLANG(w)
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#define C4_SUPPRESS_WARNING_GCC_CLANG_WITH_PUSH(w) \
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C4_SUPPRESS_WARNING_GCC_WITH_PUSH(w) \
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C4_SUPPRESS_WARNING_CLANG_WITH_PUSH(w)
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#define C4_SUPPRESS_WARNING_GCC_CLANG_POP \
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C4_SUPPRESS_WARNING_GCC_POP \
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C4_SUPPRESS_WARNING_CLANG_POP
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} // namespace c4
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#ifdef __clang__
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# pragma clang diagnostic pop
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#endif
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#endif /* _C4_ERROR_HPP_ */
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