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[buddy] Improve handling of bddtrue and bddfalse.

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* src/bdd.h, src/cppext.cxx: Handle bddtrue and bddfalse using
special types.
This commit is contained in:
Alexandre Duret-Lutz 2014-06-20 18:36:08 +02:00
parent 4df4b4efd2
commit 7d70229f5b
2 changed files with 77 additions and 11 deletions
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84
buddy/src/bdd.h
View file

@ -483,6 +483,9 @@ BUDDY_API_VAR const BDD bddtrue;
class BUDDY_API bvec;
class BUDDY_API bddxfalse;
class BUDDY_API bddxtrue;
class BUDDY_API bdd
{
public:
@ -491,6 +494,7 @@ class BUDDY_API bdd
{
root=0;
}
bdd(const bdd &r) noexcept
{
root=r.root;
@ -498,6 +502,16 @@ class BUDDY_API bdd
bdd_addref_nc(root);
}
bdd(const bddxfalse &) noexcept
{
root = 0;
}
bdd(const bddxtrue &) noexcept
{
root = 1;
}
bdd(bdd&& r) noexcept
{
root=r.root;
@ -515,6 +529,9 @@ class BUDDY_API bdd
bdd& operator=(const bdd &r) noexcept;
bdd& operator=(bdd&& r) noexcept;
bdd& operator=(const bddxtrue&) noexcept;
bdd& operator=(const bddxfalse&) noexcept;
bdd operator&(const bdd &r) const;
bdd& operator&=(const bdd &r);
bdd operator^(const bdd &r) const;
@ -531,9 +548,13 @@ class BUDDY_API bdd
bdd operator<<(const bdd &r) const;
bdd& operator<<=(const bdd &r);
int operator==(const bdd &r) const noexcept;
int operator==(const bddxfalse&) const noexcept;
int operator==(const bddxtrue&) const noexcept;
int operator!=(const bdd &r) const noexcept;
int operator!=(const bddxfalse&) const noexcept;
int operator!=(const bddxtrue&) const noexcept;
private:
protected:
BDD root;
bdd(BDD r) noexcept { root=r; if (root > 1) bdd_addref_nc(root); }
@ -541,8 +562,8 @@ private:
friend int bdd_init(int, int);
friend int bdd_setvarnum(int);
friend bdd bdd_true(void);
friend bdd bdd_false(void);
friend bddxtrue bdd_true(void);
friend bddxfalse bdd_false(void);
friend bdd bdd_ithvarpp(int);
friend bdd bdd_nithvarpp(int);
friend int bdd_var(const bdd &);
@ -637,11 +658,28 @@ private:
friend bdd bvec_neq(const bvec &left, const bvec &right);
};
class bddxfalse: public bdd
{
public:
bddxfalse(void) noexcept
{
root=0;
}
};
class bddxtrue: public bdd
{
public:
bddxtrue(void) noexcept
{
root=1;
}
};
/*=== BDD constants ====================================================*/
BUDDY_API_VAR const bdd bddfalsepp;
BUDDY_API_VAR const bdd bddtruepp;
BUDDY_API_VAR const bddxfalse bddfalsepp;
BUDDY_API_VAR const bddxtrue bddtruepp;
#define bddtrue bddtruepp
#define bddfalse bddfalsepp
@ -905,9 +943,21 @@ inline bdd& bdd::operator<<=(const bdd &r)
inline int bdd::operator==(const bdd &r) const noexcept
{ return r.root==root; }
inline int bdd::operator==(const bddxfalse&) const noexcept
{ return root==0; }
inline int bdd::operator==(const bddxtrue&) const noexcept
{ return root==1; }
inline int bdd::operator!=(const bdd &r) const noexcept
{ return r.root!=root; }
inline int bdd::operator!=(const bddxfalse&) const noexcept
{ return root!=0; }
inline int bdd::operator!=(const bddxtrue&) const noexcept
{ return root!=1; }
inline bdd& bdd::operator=(const bdd &r) noexcept
{
if (__likely(root != r.root))
@ -943,11 +993,27 @@ inline bdd& bdd::operator=(int r) noexcept
return *this;
}
inline bdd bdd_true(void)
{ return 1; }
inline bdd& bdd::operator=(const bddxfalse &) noexcept
{
if (root > 1)
bdd_delref_nc(root);
root = 0;
return *this;
}
inline bdd bdd_false(void)
{ return 0; }
inline bdd& bdd::operator=(const bddxtrue &) noexcept
{
if (root > 1)
bdd_delref_nc(root);
root = 1;
return *this;
}
inline bddxtrue bdd_true(void)
{ return bddxtrue(); }
inline bddxfalse bdd_false(void)
{ return bddxfalse(); }
/*=== Iostream printing ================================================*/

4
buddy/src/cppext.cxx
View file

@ -57,8 +57,8 @@ bdd_ioformat bddall(IOFORMAT_ALL);
bdd_ioformat fddset(IOFORMAT_FDDSET);
/* Constant true and false extension */
const bdd bddtruepp = bdd_true();
const bdd bddfalsepp = bdd_false();
const bddxtrue bddtruepp;
const bddxfalse bddfalsepp;
/* Internal prototypes */
static void bdd_printset_rec(ostream&, int, int*);