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Wave: a Standard conformant C++ preprocessor library

, 10 Jan 2004
Describes a free and fully Standard conformant C++ preprocessor library
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/*=============================================================================
    Wave: A Standard compliant C++ preprocessor

    Global application configuration
    
    Copyright (c) 2001-2004 Hartmut Kaiser
    http://spirit.sourceforge.net/

    Use, modification and distribution is subject to the Boost Software
    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
    http://www.boost.org/LICENSE_1_0.txt)

    See Copyright.txt for full acknowledgements.
=============================================================================*/

#if !defined(CPP_CONFIG_HPP_F143F90A_A63F_4B27_AC41_9CA4F14F538D_INCLUDED)
#define CPP_CONFIG_HPP_F143F90A_A63F_4B27_AC41_9CA4F14F538D_INCLUDED

///////////////////////////////////////////////////////////////////////////////
//  Decide, wheter to work in C++ or IDL mode (select exactly one!)
#if !defined(WAVE_ACT_FOR_CPP) && !defined(WAVE_ACT_FOR_IDL)
#define WAVE_ACT_FOR_CPP 1
//#define WAVE_ACT_FOR_IDL
#endif // !defined(WAVE_ACT_FOR_CPP) && !defined(WAVE_ACT_FOR_IDL)

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to reverse the macro names before storing them into the 
//  symbol tables. This may speed up things considerably, especially if the
//  used macro names are very long and start with a common prefix.
//
//  To reverse the macro names for symbol table purposes, uncomment the 
//  following
//
//#define WAVE_REVERSE_MACRONAMES_FOR_SYMBOLTABLE 1

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to implement macro scopes (#scope/#endscope), variadics,
//  placemarkers and well defined token pasting in C++ mode
//
//  To implement these features, uncomment the following
//
#define WAVE_ENABLE_CPP0X_EXTENSIONS 1

///////////////////////////////////////////////////////////////////////////////
//  Define the macro scoping keywords to be used for the experimental macro 
//  scoping support.
//
//  If the following macros aren't defined, the corresponding default value is 
//  used.
//
//  Note, if you change this, you will have to change the corresponding entries 
//  inside the wave/cpplexer/re2c/cpp.re file too.
//
//#define WAVE_PP_REGION          "region"
//#define WAVE_PP_REGION_UC       "REGION"      // uppercase of WAVE_PP_REGION
//#define WAVE_PP_ENDREGION       "endregion"
//#define WAVE_PP_IMPORT          "import"

///////////////////////////////////////////////////////////////////////////////
//  Define the maximal include nesting depth allowed. If this value isn't 
//  defined it defaults to 1024
//
//  To define a new initial include nesting depth uncomment the following and 
//  supply a new integer value.
//
//#define WAVE_MAX_INCLUDE_LEVEL_DEPTH 1024

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to support variadics and placemarkers
//
//  To implement support variadics and placemarkers uncomment the following
//
#define WAVE_SUPPORT_VARIADICS_PLACEMARKERS 1

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to implement a #warning directive as 
//
//  To implement #warning directives, uncomment the following
//
#define WAVE_SUPPORT_WARNING_DIRECTIVE 1

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to implement #pragma once 
//
//  To implement #pragma once, uncomment the following
//
#define WAVE_SUPPORT_PRAGMA_ONCE 1

///////////////////////////////////////////////////////////////////////////////
//  Undefine the following, to enable some MS specific language extensions:
//  __int8, __int16, __int32, __int64, __based, __declspec, __cdecl, 
//  __fastcall, __stdcall, __try, __except, __finally, __leave, __inline,
//  __asm
#define WAVE_SUPPORT_MS_EXTENSIONS 1

///////////////////////////////////////////////////////////////////////////////
//  Allow the message body of the #error and #warning directives to be 
//  preprocessed before the diagnostic is issued.
//
//  Uncommenting the following will preprocess the message bodies of #error and
//  #warning messages before the error (warning) is issued
//
#define WAVE_PREPROCESS_ERROR_MESSAGE_BODY 1

///////////////////////////////////////////////////////////////////////////////
//  Allow the #pragma directives to be returned to the caller (optionally after 
//  preprocessing the body) 
//
//  Undefining the following will skip #pragma directives, so that the caller
//  will not see them.
//
#define WAVE_EMIT_PRAGMA_DIRECTIVES 1

///////////////////////////////////////////////////////////////////////////////
//  Allow the body of a #pragma directive to be preprocessed before the 
//  directive is returned to the caller.
//
//  Uncommenting the following will preprocess the bodies of #pragma directives
//
#define WAVE_PREPROCESS_PRAGMA_BODY 1

///////////////////////////////////////////////////////////////////////////////
//  Allow to define macros with the command line syntax (-DMACRO(x)=definition)
//
//  Uncommenting the following will enable the possibility to define macros
//  based on the command line syntax
//
#define WAVE_ENABLE_COMMANDLINE_MACROS 1

///////////////////////////////////////////////////////////////////////////////
//  Define the string type to be used to store the token values and the file 
//  names inside a file_position template class
//
//  If this isn't defined, it defaults to std::string (std::string may be used 
//  directly, if it is based on a COW implementation (copy on write)).
//

// use the following, if you have a fast std::allocator<char>
//#define WAVE_STRINGTYPE wave::util::flex_string< \
//        char, std::char_traits<char>, std::allocator<char>, \
//            wave::util::CowString<char, \
//                wave::util::AllocatorStringStorage<char> > \
//    > \
//    /**/

// use the following otherwise
#define WAVE_STRINGTYPE wave::util::flex_string< \
        char, std::char_traits<char>, boost::fast_pool_allocator<char>, \
            wave::util::CowString<char, \
                wave::util::AllocatorStringStorage<char, \
                    boost::fast_pool_allocator<char> \
                > \
            > \
        > \
    /**/

///////////////////////////////////////////////////////////////////////////////
// Decide, which C++ lexer to use (choose one!)
//
//  If you select WAVE_USE_RE2C_IDL_LEXER, you will implicitly select the Wave 
//  IDL mode.
//

#if defined(WAVE_ACT_FOR_CPP)
//#define WAVE_USE_SLEX_CPP_LEXER 1      // use the SLex based C++ lexer
#define WAVE_USE_RE2C_CPP_LEXER 1       // use the Re2C based C++ lexer
#else
#define WAVE_USE_RE2C_IDL_LEXER 1       // use the Re2C based IDL lexer
#endif

// building an application, i.e. only one lexer is required
#if !defined(WAVE_USE_RE2C_IDL_LEXER)

#if (defined(WAVE_USE_SLEX_CPP_LEXER) && defined(WAVE_USE_RE2C_CPP_LEXER)) || \
    (!defined(WAVE_USE_SLEX_CPP_LEXER) && !defined(WAVE_USE_RE2C_CPP_LEXER))
#error "Please choose exactly one C++ lexer to use" \
    " (define WAVE_USE_SLEX_CPP_LEXER or WAVE_USE_RE2C_CPP_LEXER or WAVE_USE_RE2C_IDL_LEXER)"
#endif

#else  // !defined(WAVE_USE_RE2C_IDL_LEXER)

#if (defined(WAVE_USE_SLEX_CPP_LEXER) || defined(WAVE_USE_RE2C_CPP_LEXER))
#error "Please choose exactly one lexer to use" \
    " (define WAVE_USE_SLEX_CPP_LEXER or WAVE_USE_RE2C_CPP_LEXER or WAVE_USE_RE2C_IDL_LEXER)"
#endif

#endif // !defined(WAVE_USE_RE2C_IDL_LEXER)

///////////////////////////////////////////////////////////////////////////////
//  Define the lexer namespace to use
#if defined(WAVE_USE_RE2C_IDL_LEXER)
#define WAVE_LEXER_NS  wave::idllexer
#else
#define WAVE_LEXER_NS  wave::cpplexer
#endif

///////////////////////////////////////////////////////////////////////////////
//  Uncomment the following, if you need debug output, the 
//  BOOST_SPIRIT_DEBUG_FLAGS constants below help to fine control the amount of 
//  the generated debug output
//#define BOOST_SPIRIT_DEBUG

///////////////////////////////////////////////////////////////////////////////
//  debug rules, subrules and grammars only, for possible flags see 
//  spirit/debug.hpp
#define BOOST_SPIRIT_DEBUG_FLAGS ( \
        BOOST_SPIRIT_DEBUG_FLAGS_NODES | \
        BOOST_SPIRIT_DEBUG_FLAGS_CLOSURES \
    ) \
    /**/

///////////////////////////////////////////////////////////////////////////////
//  debug flags for the pp-iterator library, possible flags:
#define BOOST_SPIRIT_DEBUG_FLAGS_CPP_GRAMMAR            0x0001
#define BOOST_SPIRIT_DEBUG_FLAGS_TIME_CONVERSION        0x0002
#define BOOST_SPIRIT_DEBUG_FLAGS_CPP_EXPR_GRAMMAR       0x0004
#define BOOST_SPIRIT_DEBUG_FLAGS_INTLIT_GRAMMAR         0x0008
#define BOOST_SPIRIT_DEBUG_FLAGS_CHLIT_GRAMMAR          0x0010
#define BOOST_SPIRIT_DEBUG_FLAGS_DEFINED_GRAMMAR        0x0020
#define BOOST_SPIRIT_DEBUG_FLAGS_PREDEF_MACROS_GRAMMAR  0x0040

#define BOOST_SPIRIT_DEBUG_FLAGS_CPP (\
        BOOST_SPIRIT_DEBUG_FLAGS_CPP_EXPR_GRAMMAR \
    ) \
    /**/

///////////////////////////////////////////////////////////////////////////////
//
//  For all recognized preprocessor statements the output parse trees 
//  formatted as xml are printed. The formatted parse trees are streamed to the 
//  std::ostream defined by the WAVE_DUMP_PARSE_TREE_OUT constant.
//
//  Uncomment the following, if you want to see these parse trees. 
//
//#define WAVE_DUMP_PARSE_TREE 1
//#define WAVE_DUMP_PARSE_TREE_OUT std::cerr

///////////////////////////////////////////////////////////////////////////////
//
//  For all #if and #elif directives the preprocessed expressions are printed.
//  These expressions are streamed to the std::ostream defined by the 
//  WAVE_DUMP_CONDITIONAL_EXPRESSIONS_OUT constant.
//
//  Uncomment the following, if you want to see the preprocessed expressions
//
//#define WAVE_DUMP_CONDITIONAL_EXPRESSIONS 1
//#define WAVE_DUMP_CONDITIONAL_EXPRESSIONS_OUT std::cerr

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to use the separate compilation model for the instantiation 
//  of the C++ lexer objects.
//
//  If this is defined, you should explicitly instantiate the C++ lexer
//  template with the correct parameters in a separate compilation unit of
//  your program (see the files instantiate_slex_lexer.cpp and
//  instantiate_re2c_lexer.cpp). 
//
//  To use the lexer inclusion model, uncomment the following 
//
#define WAVE_SEPARATE_LEXER_INSTANTIATION 1

///////////////////////////////////////////////////////////////////////////////
//  Decide, whether to use the separate compilation model for the instantiation 
//  of the grammar objects.
//
//  If this is defined, you should explicitly instantiate the grammar
//  templates with the correct parameters in a separate compilation unit of
//  your program (see the files instantiate_cpp_grammar.cpp). 
//
//  To use the grammar inclusion model, uncomment the following 
//
#define WAVE_SEPARATE_GRAMMAR_INSTANTIATION 1

///////////////////////////////////////////////////////////////////////////////
//  You shouldn't have to change anything below

#if defined(BOOST_MSVC) && !defined(__COMO__)
#pragma warning (disable: 4355) // 'this' used in base member initializer list
#pragma warning (disable: 4800) // forcing value to bool 'true' or 'false' (performance warning)
#pragma inline_depth(255)
#pragma inline_recursion(on)
#endif // defined(BOOST_MSVC)

///////////////////////////////////////////////////////////////////////////////
//  The experimental C++0x mode implies the variadics and placemarkers
#if defined(WAVE_ENABLE_CPP0X_EXTENSIONS) && !defined(WAVE_SUPPORT_VARIADICS_PLACEMARKERS)
#define WAVE_SUPPORT_VARIADICS_PLACEMARKERS 1
#endif // 

///////////////////////////////////////////////////////////////////////////////
//  The Boost.Pool library requires to define the following constant for non-
//  threaded applications
#define BOOST_NO_MT 1

///////////////////////////////////////////////////////////////////////////////
//  If acting in IDL mode, some constants make no sense anymore
#if defined(WAVE_ACT_FOR_IDL)

#undef WAVE_ENABLE_CPP0X_EXTENSIONS
#undef WAVE_PP_REGION   
#undef WAVE_PP_REGION_UC
#undef WAVE_PP_ENDREGION
#undef WAVE_PP_IMPORT   

#undef WAVE_SUPPORT_VARIADICS_PLACEMARKERS

#endif  // defined(WAVE_ACT_FOR_IDL)

#endif // !defined(CPP_CONFIG_HPP_F143F90A_A63F_4B27_AC41_9CA4F14F538D_INCLUDED)

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About the Author

Hartmut Kaiser

United States United States
Actively involved in Boost and the development of the Spirit parser construction framework.

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