36 lines
1.5 KiB
C
36 lines
1.5 KiB
C
#ifndef PYTHON_WIN9X_MSVC600_STDBOOL_H
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#define PYTHON_WIN9X_MSVC600_STDBOOL_H
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/* VC6-only fallback for the C99 <stdbool.h> header.
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*
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* Visual C++ 6.0 (_MSC_VER 1200) predates C99 and ships no <stdbool.h>;
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* in VC6's C mode `bool`/`true`/`false` are not keywords at all (they are
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* C++-only there). This project-local header is found ahead of any system
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* <stdbool.h> only because compat/msvc600 is placed first on the VC6 probe
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* scripts' include path (scripts/vc6-probe.sh, scripts/vc6-probe-core.sh);
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* it is never installed anywhere a standards-conforming compiler's own
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* <stdbool.h> would be found instead, so it never shadows a real one. The
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* _MSC_VER guard below is defence in depth for that same reason, and keeps
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* this file inert (and diagnosable, via the #error) if it is ever reached
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* by a compiler other than the VC6 this port targets.
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*
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* Modeled on the standard C99 <stdbool.h> contract: defines the macros
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* bool, true, false, and __bool_true_false_are_defined, and (matching
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* C99, which requires a program be able to #undef/redefine bool/true/
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* false) leaves them as plain macros rather than a typedef, so existing
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* C99-style `#undef bool` idioms, were CPython to use one, would still
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* work.
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*/
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#if !defined(_MSC_VER) || _MSC_VER >= 1300
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#error "compat/msvc600/stdbool.h is a VC6-only (_MSC_VER < 1300) fallback; a standard <stdbool.h> should be used instead."
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#endif
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#define bool int
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#define true 1
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#define false 0
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#define __bool_true_false_are_defined 1
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#endif /* PYTHON_WIN9X_MSVC600_STDBOOL_H */
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