kpx_cpu/include/nvmemfun.hpp

/*
 *  nvmemfun.hpp - Non-virtual member function wrappers
 *
 *  Kheperix (C) 2003 Gwenole Beauchesne
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef NVMEMFUN_H
#define NVMEMFUN_H

#include <functional>

#if (defined(__GNUC__) || defined(__ICC))

template< class PMF, class PF >
inline PF nv_mem_fun_of(PMF pmf) {
        union { PMF pmf; uintptr p[2]; } x;
        x.pmf = pmf;
#if defined(__GXX_ABI_VERSION) /* GCC >= 3.0 */
        const int N = 0;
#else
        const int N = 1;
#endif
        return (PF)x.p[N];
}

template< class R, class T >
class nv_mem_fun_t : public std::unary_function<T, R> {
        typedef R (T::*pmf_t)();
        typedef R (*pf_t)(T *);
        pf_t pf;
public:
        nv_mem_fun_t(pmf_t pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
        R operator()(T *p) const { return (*pf)(p); }
        operator bool () const { return pf; }
};

template< class R, class T >
class const_nv_mem_fun_t : public std::unary_function<T, R> {
        typedef R (T::*pmf_t)();
        typedef R (*pf_t)(T *);
        pf_t const pf;
public:
        const_nv_mem_fun_t(pmf_t const pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
        R operator()(const T *p) const { return (*pf)(p); }
        operator bool () const { return pf; }
};

template< class R, class T, class A >
class nv_mem_fun1_t : public std::binary_function<T, A, R> {
        typedef R (T::*pmf_t)(A);
        typedef R (*pf_t)(T *, A x);
        pf_t pf;
public:
        nv_mem_fun1_t(pmf_t pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
        R operator()(T *p, A x) const { return (*pf)(p, x); }
        operator bool () const { return pf; }
};

template< class R, class T, class A >
class const_nv_mem_fun1_t : public std::binary_function<T, A, R> {
        typedef R (T::*pmf_t)(A);
        typedef R (*pf_t)(T *, A x);
        pf_t const pf;
public:
        const_nv_mem_fun1_t(pmf_t const pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
        R operator()(const T *p, A x) const { return (*pf)(p, x); }
        operator bool () const { return pf; }
};

#else

template< class R, class T >
class nv_mem_fun_t : public std::unary_function<T, R> {
        R (T::*pf)();
public:
        nv_mem_fun_t(R (T::*pmf)()) : pf(pmf) {}
        R operator()(T *p) const { return (p->*pf)(); }
        operator bool () const { return pf; }
};

template< class R, class T >
class const_nv_mem_fun_t : public std::unary_function<T, R> {
        R (T::*pf)() const;
public:
        const_nv_mem_fun_t(R (T::*pmf)() const) : pf(pmf) {}
        R operator()(const T *p) const { return (p->*pf)(); }
        operator bool () const { return pf; }
};

template< class R, class T, class A >
class nv_mem_fun1_t : public std::binary_function<T, A, R> {
        R (T::*pf)(A);
public:
        nv_mem_fun1_t(R (T::*pmf)(A)) : pf(pmf) {}
        R operator()(T *p, A x) const { return (p->*pf)(x); }
        operator bool () const { return pf; }
};

template< class R, class T, class A >
class const_nv_mem_fun1_t : public std::binary_function<T, A, R> {
        R (T::*pf)(A) const;
public:
        const_nv_mem_fun1_t(R (T::*pmf)(A) const) : pf(pmf) {}
        R operator()(const T *p, A x) const { return (p->*pf)(x); }
        operator bool () const { return pf; }
};

#endif

template< class R, class T >
inline nv_mem_fun_t<R, T> nv_mem_fun(R (T::*pmf)()) {
        return nv_mem_fun_t<R, T>(pmf);
}

template< class R, class T >
inline const_nv_mem_fun_t<R, T> nv_mem_fun(R (T::*pmf)() const) {
        return const_nv_mem_fun_t<R, T>(pmf);
}

template< class R, class T, class A >
inline nv_mem_fun1_t<R, T, A> nv_mem_fun(R (T::*pmf)(A)) {
        return nv_mem_fun1_t<R, T, A>(pmf);
}

template< class R, class T, class A >
inline const_nv_mem_fun1_t<R, T, A> nv_mem_fun(R (T::*pmf)(A) const) {
        return const_nv_mem_fun1_t<R, T, A>(pmf);
}

#endif /* NVMEMFUN_H */
Revision:	1.1
Committed:	2003-11-02T14:48:19Z (21 years ago) by gbeauche
Branch:	MAIN
Log Message:	Optimized pointers to non virtual member functions. This reduces space and overhead since runtime checks are eliminated. Actually, it yields up to 10% performance improvement with specialized decoders.
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* nvmemfun.hpp - Non-virtual member function wrappers
3			*
4			* Kheperix (C) 2003 Gwenole Beauchesne
5			*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#ifndef NVMEMFUN_H
22			#define NVMEMFUN_H
23
24			#include <functional>
25
26			#if (defined(__GNUC__) \|\| defined(__ICC))
27
28			template< class PMF, class PF >
29			inline PF nv_mem_fun_of(PMF pmf) {
30			union { PMF pmf; uintptr p[2]; } x;
31			x.pmf = pmf;
32			#if defined(__GXX_ABI_VERSION) /* GCC >= 3.0 */
33			const int N = 0;
34			#else
35			const int N = 1;
36			#endif
37			return (PF)x.p[N];
38			}
39
40			template< class R, class T >
41			class nv_mem_fun_t : public std::unary_function<T, R> {
42			typedef R (T::*pmf_t)();
43			typedef R (pf_t)(T );
44			pf_t pf;
45			public:
46			nv_mem_fun_t(pmf_t pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
47			R operator()(T p) const { return (pf)(p); }
48			operator bool () const { return pf; }
49			};
50
51			template< class R, class T >
52			class const_nv_mem_fun_t : public std::unary_function<T, R> {
53			typedef R (T::*pmf_t)();
54			typedef R (pf_t)(T );
55			pf_t const pf;
56			public:
57			const_nv_mem_fun_t(pmf_t const pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
58			R operator()(const T p) const { return (pf)(p); }
59			operator bool () const { return pf; }
60			};
61
62			template< class R, class T, class A >
63			class nv_mem_fun1_t : public std::binary_function<T, A, R> {
64			typedef R (T::*pmf_t)(A);
65			typedef R (pf_t)(T , A x);
66			pf_t pf;
67			public:
68			nv_mem_fun1_t(pmf_t pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
69			R operator()(T p, A x) const { return (pf)(p, x); }
70			operator bool () const { return pf; }
71			};
72
73			template< class R, class T, class A >
74			class const_nv_mem_fun1_t : public std::binary_function<T, A, R> {
75			typedef R (T::*pmf_t)(A);
76			typedef R (pf_t)(T , A x);
77			pf_t const pf;
78			public:
79			const_nv_mem_fun1_t(pmf_t const pmf) : pf(nv_mem_fun_of<pmf_t, pf_t>(pmf)) {}
80			R operator()(const T p, A x) const { return (pf)(p, x); }
81			operator bool () const { return pf; }
82			};
83
84			#else
85
86			template< class R, class T >
87			class nv_mem_fun_t : public std::unary_function<T, R> {
88			R (T::*pf)();
89			public:
90			nv_mem_fun_t(R (T::*pmf)()) : pf(pmf) {}
91			R operator()(T p) const { return (p->pf)(); }
92			operator bool () const { return pf; }
93			};
94
95			template< class R, class T >
96			class const_nv_mem_fun_t : public std::unary_function<T, R> {
97			R (T::*pf)() const;
98			public:
99			const_nv_mem_fun_t(R (T::*pmf)() const) : pf(pmf) {}
100			R operator()(const T p) const { return (p->pf)(); }
101			operator bool () const { return pf; }
102			};
103
104			template< class R, class T, class A >
105			class nv_mem_fun1_t : public std::binary_function<T, A, R> {
106			R (T::*pf)(A);
107			public:
108			nv_mem_fun1_t(R (T::*pmf)(A)) : pf(pmf) {}
109			R operator()(T p, A x) const { return (p->pf)(x); }
110			operator bool () const { return pf; }
111			};
112
113			template< class R, class T, class A >
114			class const_nv_mem_fun1_t : public std::binary_function<T, A, R> {
115			R (T::*pf)(A) const;
116			public:
117			const_nv_mem_fun1_t(R (T::*pmf)(A) const) : pf(pmf) {}
118			R operator()(const T p, A x) const { return (p->pf)(x); }
119			operator bool () const { return pf; }
120			};
121
122			#endif
123
124			template< class R, class T >
125			inline nv_mem_fun_t<R, T> nv_mem_fun(R (T::*pmf)()) {
126			return nv_mem_fun_t<R, T>(pmf);
127			}
128
129			template< class R, class T >
130			inline const_nv_mem_fun_t<R, T> nv_mem_fun(R (T::*pmf)() const) {
131			return const_nv_mem_fun_t<R, T>(pmf);
132			}
133
134			template< class R, class T, class A >
135			inline nv_mem_fun1_t<R, T, A> nv_mem_fun(R (T::*pmf)(A)) {
136			return nv_mem_fun1_t<R, T, A>(pmf);
137			}
138
139			template< class R, class T, class A >
140			inline const_nv_mem_fun1_t<R, T, A> nv_mem_fun(R (T::*pmf)(A) const) {
141			return const_nv_mem_fun1_t<R, T, A>(pmf);
142			}
143
144			#endif /* NVMEMFUN_H */