| 1 | //
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
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| 3 | //
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| 4 | // The contents of this file are covered under the licence agreement in the
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| 5 | // file "LICENCE" distributed with Cforall.
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| 6 | //
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| 7 | // Bitfield.hpp --
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| 8 | //
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| 9 | // Author : Aaron B. Moss
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| 10 | // Created On : Thu May 9 10:00:00 2019
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| 11 | // Last Modified By : Aaron B. Moss
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| 12 | // Last Modified On : Thu May 9 10:00:00 2019
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| 13 | // Update Count : 1
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| 14 | //
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| 15 |
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| 16 | #pragma once
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| 17 |
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| 18 | #include <strings.h> // for ffs
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| 19 |
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| 20 | /// Make a type a bitfield.
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| 21 | /// Include in type definition to add operators. Used to simulate inheritance because union
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| 22 | /// does not allow it. Requires type to have `unsigned val` field
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| 23 | /// @param BFType Name of containing type
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| 24 | #define MakeBitfield( BFType ) \
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| 25 | constexpr BFType() : val( 0 ) {} \
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| 26 | constexpr BFType( unsigned int v ) : val( v ) {} \
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| 27 | bool operator[]( unsigned int i ) const { return val & (1 << i); } \
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| 28 | bool any() const { return val != 0; } \
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| 29 | void reset() { val = 0; } \
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| 30 | int ffs() { return ::ffs( val ) - 1; } \
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| 31 | BFType operator&=( BFType other ) { \
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| 32 | val &= other.val; return *this; \
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| 33 | } \
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| 34 | BFType operator&( BFType other ) const { \
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| 35 | BFType q = other; \
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| 36 | q &= *this; \
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| 37 | return q; \
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| 38 | } \
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| 39 | BFType operator|=( BFType other ) { \
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| 40 | val |= other.val; return *this; \
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| 41 | } \
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| 42 | BFType operator|( BFType other ) const { \
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| 43 | BFType q = other; \
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| 44 | q |= *this; \
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| 45 | return q; \
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| 46 | } \
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| 47 | BFType operator-=( BFType other ) { \
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| 48 | val &= ~other.val; return *this; \
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| 49 | }
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| 50 |
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| 51 | /// Adds default printing operator to a bitfield type.
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| 52 | /// Include in definition to add print function, requires other bitfield operators.
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| 53 | /// @param N Number of bits in bitfield
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| 54 | #define MakeBitfieldPrint( N ) \
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| 55 | static const char* Names[]; \
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| 56 | void print( std::ostream & os ) const { \
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| 57 | if ( (*this).any() ) { \
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| 58 | for ( unsigned int i = 0; i < N; i += 1 ) { \
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| 59 | if ( (*this)[i] ) { \
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| 60 | os << Names[i] << ' '; \
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| 61 | } \
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| 62 | } \
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| 63 | } \
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| 64 | }
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| 65 |
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| 66 | // Local Variables: //
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| 67 | // tab-width: 4 //
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| 68 | // mode: c++ //
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| 69 | // compile-command: "make install" //
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| 70 | // End: //
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