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24 lines
456 B
D
24 lines
456 B
D
module assign;
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// this is taken from std.intrinsic from gdc
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int mybtc(uint *p, uint bitnum)
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{
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uint * q = p + (bitnum / (uint.sizeof*8));
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uint mask = 1 << (bitnum & ((uint.sizeof*8) - 1));
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int result = *q & mask;
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*q ^= mask;
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return result ? -1 : 0;
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}
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void main()
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{
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uint i = 0xFFFF_FFFF;
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int r = mybtc(&i, 31);
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assert(r);
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assert(i == 0x7FFF_FFFF);
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r = mybtc(&i, 31);
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assert(!r);
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assert(i == 0xFFFF_FFFF);
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}
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