mirror of
https://github.com/mruby/mruby
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cremno
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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** mruby/numeric.h - Numeric, Integer, Float, Fixnum class
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**
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** See Copyright Notice in mruby.h
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*/
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#ifndef MRUBY_NUMERIC_H
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#define MRUBY_NUMERIC_H
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#define POSFIXABLE(f) ((f) <= MRB_INT_MAX)
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#define NEGFIXABLE(f) ((f) >= MRB_INT_MIN)
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#define FIXABLE(f) (POSFIXABLE(f) && NEGFIXABLE(f))
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mrb_value mrb_flo_to_fixnum(mrb_state *mrb, mrb_value val);
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mrb_value mrb_fixnum_to_str(mrb_state *mrb, mrb_value x, int base);
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mrb_value mrb_fixnum_plus(mrb_state *mrb, mrb_value x, mrb_value y);
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mrb_value mrb_fixnum_minus(mrb_state *mrb, mrb_value x, mrb_value y);
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mrb_value mrb_fixnum_mul(mrb_state *mrb, mrb_value x, mrb_value y);
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mrb_value mrb_num_div(mrb_state *mrb, mrb_value x, mrb_value y);
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mrb_float mrb_to_flo(mrb_state *mrb, mrb_value x);
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#define MRB_UINT_MAKE2(n) uint ## n ## _t
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#define MRB_UINT_MAKE(n) MRB_UINT_MAKE2(n)
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#define mrb_uint MRB_UINT_MAKE(MRB_INT_BIT)
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#ifdef MRB_WORD_BOXING
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# define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1 - MRB_FIXNUM_SHIFT))
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#else
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# define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1))
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#endif
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static inline mrb_bool
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mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
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{
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mrb_uint x = (mrb_uint)augend;
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mrb_uint y = (mrb_uint)addend;
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mrb_uint z = (mrb_uint)(x + y);
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*sum = (mrb_int)z;
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return !!(((x ^ z) & (y ^ z)) & MRB_INT_OVERFLOW_MASK);
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}
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#undef MRB_INT_OVERFLOW_MASK
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#undef mrb_uint
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#undef MRB_UINT_MAKE
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#undef MRB_UINT_MAKE2
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#if defined(__cplusplus)
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} /* extern "C" { */
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#endif
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#endif /* MRUBY_NUMERIC_H */
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