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# constraints.hh

    00001 // constraints.hh: this file is part of the Vaucanson project.
    00002 //
    00003 // Vaucanson, a generic library for finite state machines.
    00004 //
    00005 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 The Vaucanson Group.
    00006 //
    00007 // This program is free software; you can redistribute it and/or
    00008 // modify it under the terms of the GNU General Public License
    00009 // as published by the Free Software Foundation; either version 2
    00010 // of the License, or (at your option) any later version.
    00011 //
    00012 // The complete GNU General Public Licence Notice can be found as the
    00013 // `COPYING' file in the root directory.
    00014 //
    00015 // The Vaucanson Group consists of people listed in the `AUTHORS' file.
    00016 //
    00017 #ifndef VCSN_MISC_CONSTRAINTS_HH
    00018 # define VCSN_MISC_CONSTRAINTS_HH
    00019
    00020
    00021 namespace vcsn
    00022 {
    00023   namespace misc
    00024   {
    00025
    00026   /*---------------------------.
    00027   | Static constraint checking |
    00028   `---------------------------*/
    00029
    00030     // this stuff is heavily inspired from the C++ Boost Library.
    00031     // Use it sparingly, it can cause HUGE amounts of template instanciations.
    00032
    00033 # if defined(__GNUC__)
    00034 #  define UnusedConceptVar __attribute__ ((__unused__))
    00035 # else
    00036 #  define UnusedConceptVar /* unused */
    00037 # endif
    00038
    00039     namespace concepts
    00040     {
    00041       template <typename Concept_>
    00042       static void function_requires()
    00043       {
    00044         void (Concept_::*ptr)() UnusedConceptVar = &Concept_::constraints;
    00045       }
    00046
    00047       // deep wizardry at work here...
    00048
    00049 # define MISC_CLASS_CHECKING_IDX(Lineno, Concept, T) \
    00050       ConceptChecking ## Lineno ## _ ## Concept ## T
    00051 # define MISC_CLASS_CHECKING_ID(Lineno, Concept, T)     \
    00052       MISC_CLASS_CHECKING_IDX(Lineno, Concept, T)
    00053 # define MISC_CLASS_FPTR_IDX(Lineno, Concept, T)        \
    00054       Concept ## Lineno ## _fptr_ ## T
    00055 # define MISC_CLASS_FPTR_ID(Lineno, Concept, T) \
    00056       MISC_CLASS_FPTR_IDX(Lineno, Concept, T)
    00057
    00058 # ifdef VCSN_NDEBUG
    00059
    00060 #  define MISC_CLASS_REQUIRE_CONCEPT(Var, Namespace, Concept)   \
    00061       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00062 #  define MISC_CLASS_REQUIRE_CONCEPT2(Var1, Var2, Namespace, Concept) \
    00063       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00064 #  define MISC_CLASS_REQUIRE_CONCEPT3(Var1, Var2, Var3, Namespace, Concept) \
    00065       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00066 #  define MISC_CLASS_REQUIRE_CONCEPT4(Var1, Var2, Var3, Var4, Namespace, Concept) \
    00067       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00068 #  define MISC_REQUIRE_CONCEPT(Var, Namespace, Concept)         \
    00069       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00070 #  define MISC_REQUIRE_CONCEPT2(Var1, Var2, Namespace, Concept) \
    00071       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00072 #  define MISC_REQUIRE_CONCEPT3(Var1, Var2, Var3, Namespace, Concept) \
    00073       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00074 #  define MISC_REQUIRE_CONCEPT4(Var1, Var2, Var3, Var4, Namespace, Concept) \
    00075       typedef void MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00076
    00077 # else // VCSN_NDEBUG
    00078
    00079       // these should be left 120 columns wide for better readability
    00080
    00081 #  define MISC_CLASS_REQUIRE_CONCEPT(Var, Namespace, Concept)   \
    00082       typedef void (Namespace::Concept <Var>::* MISC_CLASS_FPTR_ID(__LINE__, Concept, t))();    \
    00083       template <MISC_CLASS_FPTR_ID(__LINE__, Concept, t) MISC_CLASS_FPTR_ID(__LINE__, Concept, arg)> \
    00084       struct MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s) {};  \
    00085       typedef MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s)<& Namespace::Concept<Var>::constraints> \
    00086               MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00087
    00088 #  define MISC_CLASS_REQUIRE_CONCEPT2(Var1, Var2, Namespace, Concept) \
    00089       typedef void (Namespace::Concept <Var1,Var2>::* MISC_CLASS_FPTR_ID(__LINE__, Concept, t))(); \
    00090       template <MISC_CLASS_FPTR_ID(__LINE__, Concept, t) MISC_CLASS_FPTR_ID(__LINE__, Concept, arg)> \
    00091       struct MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s) {};  \
    00092       typedef MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s)<& Namespace::Concept<Var1,Var2>::constraints> \
    00093               MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00094
    00095 #  define MISC_CLASS_REQUIRE_CONCEPT3(Var1, Var2, Var3, Namespace, Concept) \
    00096       typedef void (Namespace::Concept <Var1,Var2,Var3>::* MISC_CLASS_FPTR_ID(__LINE__, Concept, t))(); \
    00097       template <MISC_CLASS_FPTR_ID(__LINE__, Concept, t) MISC_CLASS_FPTR_ID(__LINE__, Concept, arg)> \
    00098       struct MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s) {};  \
    00099       typedef MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s)<& Namespace::Concept<Var1,Var2,Var3>::constraints> \
    00100               MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00101
    00102 #  define MISC_CLASS_REQUIRE_CONCEPT4(Var1, Var2, Var3, Var4, Namespace, Concept) \
    00103       typedef void (Namespace::Concept <Var1,Var2,Var3,Var4>::* MISC_CLASS_FPTR_ID(__LINE__, Concept, t))();    \
    00104       template <MISC_CLASS_FPTR_ID(__LINE__, Concept, t) MISC_CLASS_FPTR_ID(__LINE__, Concept, arg)> \
    00105       struct MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s) {};  \
    00106       typedef MISC_CLASS_CHECKING_ID(__LINE__, Concept, _s)<& Namespace::Concept<Var1,Var2,Var3,Var4>::constraints> \
    00107               MISC_CLASS_CHECKING_ID(__LINE__, Concept, _t)
    00108
    00109 #  define MISC_REQUIRE_CONCEPT(Var, Namespace, Concept)         \
    00110       vcsn::misc::concepts::function_requires<Namespace::Concept <Var> >()
    00111 #  define MISC_REQUIRE_CONCEPT2(Var1, Var2, Namespace, Concept) \
    00112       vcsn::misc::concepts::function_requires<Namespace::Concept <Var1, Var2> >()
    00113 #  define MISC_REQUIRE_CONCEPT3(Var1, Var2, Var3, Namespace, Concept) \
    00114       vcsn::misc::concepts::function_requires<Namespace::Concept <Var1, Var2, Var3> >()
    00115 #  define MISC_REQUIRE_CONCEPT4(Var1, Var2, Var3, Var4, Namespace, Concept) \
    00116       vcsn::misc::concepts::function_requires<Namespace::Concept <Var1, Var2, Var3, Var4> >()
    00117
    00118 # endif // ! VCSN_NDEBUG
    00119
    00120     } // concepts
    00121   } // misc
    00122 } // vcsn
    00123
    00124 #endif // ! VCSN_MISC_CONSTRAINTS_HH