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Diffstat (limited to 'Include/pymacro.h')
-rw-r--r-- | Include/pymacro.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/Include/pymacro.h b/Include/pymacro.h new file mode 100644 index 0000000..22f1d71 --- /dev/null +++ b/Include/pymacro.h @@ -0,0 +1,57 @@ +#ifndef Py_PYMACRO_H +#define Py_PYMACRO_H + +#define Py_MIN(x, y) (((x) > (y)) ? (y) : (x)) +#define Py_MAX(x, y) (((x) > (y)) ? (x) : (y)) + +/* Argument must be a char or an int in [-128, 127] or [0, 255]. */ +#define Py_CHARMASK(c) ((unsigned char)((c) & 0xff)) + + +/* Assert a build-time dependency, as an expression. + + Your compile will fail if the condition isn't true, or can't be evaluated + by the compiler. This can be used in an expression: its value is 0. + + Example: + + #define foo_to_char(foo) \ + ((char *)(foo) \ + + Py_BUILD_ASSERT(offsetof(struct foo, string) == 0)) + + Written by Rusty Russell, public domain. */ +#define Py_BUILD_ASSERT(cond) \ + (sizeof(char [1 - 2*!(cond)]) - 1) + +#if defined(__GNUC__) +/* Two gcc extensions. + &a[0] degrades to a pointer: a different type from an array */ +#define _Py_ARRAY_LENGTH_CHECK(array) \ + Py_BUILD_ASSERT(!__builtin_types_compatible_p(typeof(array), \ + typeof(&(array)[0]))) +#else +#define _Py_ARRAY_LENGTH_CHECK(array) 0 +#endif + + +/* Get the number of elements in a visible array + + This does not work on pointers, or arrays declared as [], or function + parameters. With correct compiler support, such usage will cause a build + error (see Py_BUILD_ASSERT). + + Written by Rusty Russell, public domain. */ +#define Py_ARRAY_LENGTH(array) \ + (sizeof(array) / sizeof((array)[0]) + _Py_ARRAY_LENGTH_CHECK(array)) + + +/* Define macros for inline documentation. */ +#define PyDoc_VAR(name) static char name[] +#define PyDoc_STRVAR(name,str) PyDoc_VAR(name) = PyDoc_STR(str) +#ifdef WITH_DOC_STRINGS +#define PyDoc_STR(str) str +#else +#define PyDoc_STR(str) "" +#endif + +#endif /* Py_PYMACRO_H */ |