ceph/src/boost/libs/tti/doc/tti_detail.qbk

   1 [/
   2   (C) Copyright Edward Diener 2011,2012
   3   Distributed under the Boost Software License, Version 1.0.
   4   (See accompanying file LICENSE_1_0.txt or copy at
   5   http://www.boost.org/LICENSE_1_0.txt).
   6 ]
   7
   8 [section:tti_detail Macro Metafunctions]
   9
  10 The TTI library uses macros to create metafunctions, in the current scope,
  11 for introspecting an inner element by name. Each macro for a particular type of inner
  12 element has two forms, the simple one where the first macro parameter designating the
  13 'name' of the inner element is used to create the name of the metafunction, and the
  14 complex one where the first macro parameter, called 'trait', designates
  15 the name of the metafunction and the second macro parameter designates the 'name' to be
  16 introspected. Other than that difference, the two forms of the macro create metafunctions
  17 which have the exact same functionality.
  18
  19 To use these metafunctions you can include the main general header file 'boost/tti/tti.hpp',
  20 unless otherwise noted. Alternatively you can include a specific header file as
  21 given in the table below.
  22
  23 A table of these macros is given, based on the inner element whose
  24 existence the metaprogrammer is introspecting. More detailed explanations
  25 and examples for each of the macro metafunctions will follow this
  26 section in the documentation. The actual syntax for each macro metafunction
  27 can be found in the reference section, and examples of usage for all the
  28 macro metafunctions can be found in the
  29 [link sectti_usingMM "Using the Macro Metafunctions"] section.
  30
  31 In the Template column only the name generated by the simple form
  32 of the template is given since the name generated by the complex form is always 'trait'
  33 where 'trait' is the first parameter to the corresponding complex form macro.
  34
  35 All of the introspecting metafunctions in the table below return a boolean constant
  36 called 'value', which specifies whether or not the inner element exists. All of the
  37 metafunctions also have a nested type called 'type', which for each one is the type
  38 of the boolean constant value. This is always boost::mpl::bool_.
  39
  40 [table:tbmacros TTI Macro Metafunctions
  41   [
  42     [Inner Element]
  43     [Macro]
  44     [Template]
  45     [Specific Header File]
  46   ]
  47   [
  48     [Type]
  49     [
  50     [macroref BOOST_TTI_HAS_TYPE](name)
  51     ]
  52     [
  53     `has_type_'name'`
  54
  55     class TTI_T = enclosing type
  56     ]
  57     [[headerref boost/tti/has_type.hpp `has_type.hpp`]]
  58   ]
  59   [
  60     [Type with lambda expression]
  61     [
  62     [macroref BOOST_TTI_HAS_TYPE](name)
  63     ]
  64     [
  65     `has_type_'name'`
  66
  67     class TTI_T = enclosing type
  68
  69     class TTI_U = lambda expression invoked with the inner type and returning a boolean constant
  70     ]
  71     [[headerref boost/tti/has_type.hpp `has_type.hpp`]]
  72   ]
  73   [
  74     [Class Template ( using variadic macros )]
  75     [
  76     [macroref BOOST_TTI_HAS_TEMPLATE](name)
  77     ]
  78     [
  79     `has_template_'name'`
  80
  81     class TTI_T = enclosing type
  82
  83     All of the template parameters must be template type parameters ( 'class' or 'typename' parameters )
  84     ]
  85     [[headerref boost/tti/has_template.hpp `has_template.hpp`]]
  86   ]
  87   [
  88     [Class Template ( not using variadic macros )]
  89     [
  90     [macroref BOOST_TTI_HAS_TEMPLATE](name,BOOST_PP_NIL)
  91     ]
  92     [
  93     `has_template_'name'`
  94
  95     class TTI_T = enclosing type
  96
  97     All of the template parameters must be template type parameters ( 'class' or 'typename' parameters )
  98     ]
  99     [[headerref boost/tti/has_template.hpp `has_template.hpp`]]
 100   ]
 101   [
 102     [Class Template with params ( using variadic macros )]
 103     [
 104     [macroref BOOST_TTI_HAS_TEMPLATE](name,...[footnote The template parameters as variadic data.])
 105     ]
 106     [
 107     `has_template_'name'`
 108
 109     class TTI_T = enclosing type
 110     ]
 111     [[headerref boost/tti/has_template.hpp `has_template.hpp`]]
 112   ]
 113   [
 114     [Class Template with params]
 115     [
 116     [macroref BOOST_TTI_HAS_TEMPLATE](name,ppArray[footnote The template parameters as the tuple part of the PP array.])
 117     ]
 118     [
 119     `has_template_'name'`
 120
 121     class TTI_T = enclosing type
 122     ]
 123     [[headerref boost/tti/has_template.hpp `has_template.hpp`]]
 124   ]
 125   [
 126     [Member data]
 127     [
 128     [macroref BOOST_TTI_HAS_MEMBER_DATA](name)
 129     ]
 130     [
 131     `has_member_data_'name'`
 132
 133     class TTI_T = enclosing type
 134                       OR
 135                   pointer to member data ( 'MemberData_Type Enclosing_Type::*' )
 136
 137     class TTI_R = (optional) data type
 138                   If the first parameter is the pointer to member data this must not be specified.
 139     ]
 140     [[headerref boost/tti/has_member_data.hpp `has_member_data.hpp`]]
 141   ]
 142   [
 143     [Member function]
 144     [
 145     [macroref BOOST_TTI_HAS_MEMBER_FUNCTION](name)
 146     ]
 147     [
 148     `has_member_function_'name'`
 149
 150     class TTI_T   = enclosing type
 151                         OR
 152                     pointer to member function
 153                     ( 'Return_Type Enclosing_Type::* ( Zero or more comma-separated parameter types )' )
 154
 155     class TTI_R   = (optional) return type if the first parameter is the enclosing type.
 156                     If the first parameter is the pointer to member function this must not be specified.
 157
 158     class TTI_FS  = (optional) function parameter types as a Boost MPL forward sequence.
 159                     If the first parameter is the pointer to member function this must not be specified.
 160                     If there are no function parameters this does not have to be specified.
 161                     Defaults to boost::mpl::vector<>.
 162
 163     class TTI_TAG = (optional) Boost `function_types` tag type.
 164                     If the first parameter is the pointer to member function this must not be specified.
 165                     Defaults to `boost::function_types::null_tag`.
 166     ]
 167     [[headerref boost/tti/has_member_function.hpp `has_member_function.hpp`]]
 168   ]
 169   [
 170     [Static member data]
 171     [
 172     [macroref BOOST_TTI_HAS_STATIC_MEMBER_DATA](name)
 173     ]
 174     [
 175     `has_static_member_data_'name'`
 176
 177     class TTI_T = enclosing type
 178
 179     class TTI_Type = data type
 180     ]
 181     [[headerref boost/tti/has_static_member_data.hpp `has_static_member_data.hpp`]]
 182   ]
 183   [
 184     [Static member function]
 185     [
 186     [macroref BOOST_TTI_HAS_STATIC_MEMBER_FUNCTION](name)
 187     ]
 188     [
 189     `has_static_member_function_'name'`
 190
 191     class TTI_T   = enclosing type
 192
 193     class TTI_R   = return type
 194                         OR
 195                     function type ( 'Return_Type (Zero or more comma-separated parameter types)' )
 196
 197     class TTI_FS  = (optional) function parameter types as a Boost MPL forward sequence.
 198                     If the second parameter is the function type this must not be specified.
 199                     If there are no function parameters, this does not have to be specified.
 200                     Defaults to boost::mpl::vector<>.
 201
 202     class TTI_TAG = (optional) Boost `function_types` tag type.
 203                     If the second parameter is the function type this must not be specified.
 204                     Defaults to `boost::function_types::null_tag`.
 205     ]
 206     [[headerref boost/tti/has_static_member_function.hpp `has_static_member_function.hpp`]]
 207   ]
 208   [
 209     [Data, either member data or static member data]
 210     [
 211     [macroref BOOST_TTI_HAS_DATA](name)
 212     ]
 213     [
 214     `has_data_'name'`
 215
 216     class TTI_T = enclosing type
 217
 218     class TTI_Type = data type
 219     ]
 220     [[headerref boost/tti/has_data.hpp `has_data.hpp`]]
 221   ]
 222   [
 223     [Function, either member function or static member function]
 224     [
 225     [macroref BOOST_TTI_HAS_FUNCTION](name)
 226     ]
 227     [
 228     `has_function_'name'`
 229
 230     class TTI_T   = enclosing type
 231
 232     class TTI_R   = return type
 233
 234     class TTI_FS  = (optional) function parameter types as a Boost MPL forward sequence.
 235                     If there are no function parameters, this does not have to be specified.
 236                     Defaults to boost::mpl::vector<>.
 237
 238     class TTI_TAG = (optional) Boost `function_types` tag type.
 239                     Defaults to `boost::function_types::null_tag`.
 240     ]
 241     [[headerref boost/tti/has_function.hpp `has_function.hpp`]]
 242   ]
 243 ]
 244
 245 [endsect]