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      1 // Copyright 2010 The RE2 Authors.  All Rights Reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 #ifndef RE2_VARIADIC_FUNCTION_H_
      6 #define RE2_VARIADIC_FUNCTION_H_
      7 
      8 namespace re2 {
      9 
     10 template <typename Result, typename Param0, typename Param1, typename Arg,
     11           Result (*Func)(Param0, Param1, const Arg* const [], int count)>
     12 class VariadicFunction2 {
     13  public:
     14   VariadicFunction2() {}
     15 
     16   Result operator()(Param0 p0, Param1 p1) const {
     17     return Func(p0, p1, 0, 0);
     18   }
     19 
     20   Result operator()(Param0 p0, Param1 p1, const Arg& a0) const {
     21     const Arg* const args[] = { &a0 };
     22     return Func(p0, p1, args, 1);
     23   }
     24 
     25   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1) const {
     26     const Arg* const args[] = { &a0, &a1 };
     27     return Func(p0, p1, args, 2);
     28   }
     29 
     30   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     31       const Arg& a2) const {
     32     const Arg* const args[] = { &a0, &a1, &a2 };
     33     return Func(p0, p1, args, 3);
     34   }
     35 
     36   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     37       const Arg& a2, const Arg& a3) const {
     38     const Arg* const args[] = { &a0, &a1, &a2, &a3 };
     39     return Func(p0, p1, args, 4);
     40   }
     41 
     42   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     43       const Arg& a2, const Arg& a3, const Arg& a4) const {
     44     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4 };
     45     return Func(p0, p1, args, 5);
     46   }
     47 
     48   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     49       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5) const {
     50     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5 };
     51     return Func(p0, p1, args, 6);
     52   }
     53 
     54   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     55       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
     56       const Arg& a6) const {
     57     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6 };
     58     return Func(p0, p1, args, 7);
     59   }
     60 
     61   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     62       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
     63       const Arg& a6, const Arg& a7) const {
     64     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7 };
     65     return Func(p0, p1, args, 8);
     66   }
     67 
     68   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     69       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
     70       const Arg& a6, const Arg& a7, const Arg& a8) const {
     71     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8 };
     72     return Func(p0, p1, args, 9);
     73   }
     74 
     75   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     76       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
     77       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9) const {
     78     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
     79         &a9 };
     80     return Func(p0, p1, args, 10);
     81   }
     82 
     83   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     84       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
     85       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
     86       const Arg& a10) const {
     87     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
     88         &a9, &a10 };
     89     return Func(p0, p1, args, 11);
     90   }
     91 
     92   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
     93       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
     94       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
     95       const Arg& a10, const Arg& a11) const {
     96     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
     97         &a9, &a10, &a11 };
     98     return Func(p0, p1, args, 12);
     99   }
    100 
    101   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    102       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    103       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    104       const Arg& a10, const Arg& a11, const Arg& a12) const {
    105     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    106         &a9, &a10, &a11, &a12 };
    107     return Func(p0, p1, args, 13);
    108   }
    109 
    110   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    111       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    112       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    113       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13) const {
    114     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    115         &a9, &a10, &a11, &a12, &a13 };
    116     return Func(p0, p1, args, 14);
    117   }
    118 
    119   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    120       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    121       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    122       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    123       const Arg& a14) const {
    124     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    125         &a9, &a10, &a11, &a12, &a13, &a14 };
    126     return Func(p0, p1, args, 15);
    127   }
    128 
    129   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    130       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    131       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    132       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    133       const Arg& a14, const Arg& a15) const {
    134     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    135         &a9, &a10, &a11, &a12, &a13, &a14, &a15 };
    136     return Func(p0, p1, args, 16);
    137   }
    138 
    139   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    140       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    141       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    142       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    143       const Arg& a14, const Arg& a15, const Arg& a16) const {
    144     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    145         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16 };
    146     return Func(p0, p1, args, 17);
    147   }
    148 
    149   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    150       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    151       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    152       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    153       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17) const {
    154     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    155         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17 };
    156     return Func(p0, p1, args, 18);
    157   }
    158 
    159   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    160       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    161       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    162       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    163       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    164       const Arg& a18) const {
    165     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    166         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18 };
    167     return Func(p0, p1, args, 19);
    168   }
    169 
    170   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    171       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    172       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    173       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    174       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    175       const Arg& a18, const Arg& a19) const {
    176     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    177         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19 };
    178     return Func(p0, p1, args, 20);
    179   }
    180 
    181   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    182       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    183       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    184       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    185       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    186       const Arg& a18, const Arg& a19, const Arg& a20) const {
    187     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    188         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19,
    189         &a20 };
    190     return Func(p0, p1, args, 21);
    191   }
    192 
    193   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    194       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    195       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    196       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    197       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    198       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21) const {
    199     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    200         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    201         &a21 };
    202     return Func(p0, p1, args, 22);
    203   }
    204 
    205   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    206       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    207       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    208       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    209       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    210       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    211       const Arg& a22) const {
    212     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    213         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    214         &a21, &a22 };
    215     return Func(p0, p1, args, 23);
    216   }
    217 
    218   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    219       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    220       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    221       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    222       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    223       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    224       const Arg& a22, const Arg& a23) const {
    225     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    226         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    227         &a21, &a22, &a23 };
    228     return Func(p0, p1, args, 24);
    229   }
    230 
    231   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    232       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    233       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    234       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    235       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    236       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    237       const Arg& a22, const Arg& a23, const Arg& a24) const {
    238     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    239         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    240         &a21, &a22, &a23, &a24 };
    241     return Func(p0, p1, args, 25);
    242   }
    243 
    244   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    245       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    246       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    247       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    248       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    249       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    250       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25) const {
    251     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    252         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    253         &a21, &a22, &a23, &a24, &a25 };
    254     return Func(p0, p1, args, 26);
    255   }
    256 
    257   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    258       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    259       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    260       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    261       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    262       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    263       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25,
    264       const Arg& a26) const {
    265     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    266         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    267         &a21, &a22, &a23, &a24, &a25, &a26 };
    268     return Func(p0, p1, args, 27);
    269   }
    270 
    271   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    272       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    273       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    274       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    275       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    276       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    277       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25,
    278       const Arg& a26, const Arg& a27) const {
    279     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    280         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    281         &a21, &a22, &a23, &a24, &a25, &a26, &a27 };
    282     return Func(p0, p1, args, 28);
    283   }
    284 
    285   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    286       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    287       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    288       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    289       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    290       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    291       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25,
    292       const Arg& a26, const Arg& a27, const Arg& a28) const {
    293     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    294         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    295         &a21, &a22, &a23, &a24, &a25, &a26, &a27, &a28 };
    296     return Func(p0, p1, args, 29);
    297   }
    298 
    299   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    300       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    301       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    302       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    303       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    304       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    305       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25,
    306       const Arg& a26, const Arg& a27, const Arg& a28, const Arg& a29) const {
    307     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    308         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    309         &a21, &a22, &a23, &a24, &a25, &a26, &a27, &a28, &a29 };
    310     return Func(p0, p1, args, 30);
    311   }
    312 
    313   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    314       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    315       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    316       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    317       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    318       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    319       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25,
    320       const Arg& a26, const Arg& a27, const Arg& a28, const Arg& a29,
    321       const Arg& a30) const {
    322     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    323         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    324         &a21, &a22, &a23, &a24, &a25, &a26, &a27, &a28, &a29, &a30 };
    325     return Func(p0, p1, args, 31);
    326   }
    327 
    328   Result operator()(Param0 p0, Param1 p1, const Arg& a0, const Arg& a1,
    329       const Arg& a2, const Arg& a3, const Arg& a4, const Arg& a5,
    330       const Arg& a6, const Arg& a7, const Arg& a8, const Arg& a9,
    331       const Arg& a10, const Arg& a11, const Arg& a12, const Arg& a13,
    332       const Arg& a14, const Arg& a15, const Arg& a16, const Arg& a17,
    333       const Arg& a18, const Arg& a19, const Arg& a20, const Arg& a21,
    334       const Arg& a22, const Arg& a23, const Arg& a24, const Arg& a25,
    335       const Arg& a26, const Arg& a27, const Arg& a28, const Arg& a29,
    336       const Arg& a30, const Arg& a31) const {
    337     const Arg* const args[] = { &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7, &a8,
    338         &a9, &a10, &a11, &a12, &a13, &a14, &a15, &a16, &a17, &a18, &a19, &a20,
    339         &a21, &a22, &a23, &a24, &a25, &a26, &a27, &a28, &a29, &a30, &a31 };
    340     return Func(p0, p1, args, 32);
    341   }
    342 };
    343 
    344 }  // namespace re2
    345 
    346 #endif  // RE2_VARIADIC_FUNCTION_H_
    347