Question

我一直在研究Boost :: Spirit的教程，我正在尝试编译一个超级简单的解析器，用于将数字加在一起，大致基于文档中的MiniXML example。我在Xcode 5.1.1中编译时遇到了麻烦。

我减少了它，发现即使是语法的定义也无法编译。这是它目前的状态：

Syntax.h：

#pragma once

#include <boost/spirit/include/qi.hpp>

namespace qi = boost::spirit::qi;


template <typename Iterator>
struct ExpressionGrammer : qi::grammar<Iterator, double(), ascii::space_type>
{
    qi::rule<Iterator, double(), ascii::space_type> expression;
    qi::rule<Iterator, double(), ascii::space_type> addsub;

    ExpressionGrammer()
    : ExpressionGrammer::base_type(expression)
    {
        using qi::lit;

        addsub = (expression >> '+' >> expression)[_val = _1 + _2];     
        expression = (addsub | qi::double_)[_val = _1];
    }
};

Syntax.cpp：

#include "Syntax.h"

// Nothing else

错误很长且详细，但从解析问题开始是无法提供信息“匿名结构声明必须是一个定义”。第一节我将粘贴在这里。（注意行号不匹配，因为我省略了注释掉的代码）

In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:9:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.h:12:
In file included from ../../../Cinder/boost/boost/spirit/include/qi.hpp:16:
In file included from ../../../Cinder/boost/boost/spirit/home/qi.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/action.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/action/action.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/meta_compiler.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/support/meta_compiler.hpp:19:
In file included from ../../../Cinder/boost/boost/proto/proto.hpp:12:
In file included from ../../../Cinder/boost/boost/proto/core.hpp:21:
In file included from ../../../Cinder/boost/boost/proto/fusion.hpp:22:
In file included from ../../../Cinder/boost/boost/fusion/include/intrinsic.hpp:10:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/back.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/end.hpp:17:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/detail/segmented_end.hpp:10:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/detail/segmented_end_impl.hpp:14:
../../../Cinder/boost/boost/fusion/container/list/cons_fwd.hpp:13:5: error: declaration of anonymous struct must be a definition
    struct nil;
    ^
../../../Cinder/boost/boost/fusion/container/list/cons_fwd.hpp:13:5: warning: declaration does not declare anything [-Wmissing-declarations]
    struct nil;
    ^~~~~~
../../../Cinder/boost/boost/fusion/container/list/cons_fwd.hpp:15:44: error: expected a type
    template <typename Car, typename Cdr = nil>
                                           ^
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:1:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/SpiritTest_Prefix.pch:8:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/AppBasic.h:27:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/App.h:27:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/Renderer.h:32:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:19:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:38:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h:68:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/MacTypes.h:90:17: note: expanded from macro 'nil'
    #define nil NULL
                ^
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:1:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/SpiritTest_Prefix.pch:6:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/Cinder.h:92:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/chrono:280:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/type_traits:203:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cstddef:44:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/5.1/include/stddef.h:72:18: note: expanded from macro 'NULL'
#    define NULL __null
                 ^
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:9:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.h:12:
In file included from ../../../Cinder/boost/boost/spirit/include/qi.hpp:16:
In file included from ../../../Cinder/boost/boost/spirit/home/qi.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/action.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/action/action.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/meta_compiler.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/support/meta_compiler.hpp:19:
In file included from ../../../Cinder/boost/boost/proto/proto.hpp:12:
In file included from ../../../Cinder/boost/boost/proto/core.hpp:21:
In file included from ../../../Cinder/boost/boost/proto/fusion.hpp:22:
In file included from ../../../Cinder/boost/boost/fusion/include/intrinsic.hpp:10:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/back.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/end.hpp:17:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/detail/segmented_end.hpp:10:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/detail/segmented_end_impl.hpp:14:
../../../Cinder/boost/boost/fusion/container/list/cons_fwd.hpp:15:44: error: expected ',' or '>' in template-parameter-list
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:1:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/SpiritTest_Prefix.pch:8:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/AppBasic.h:27:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/App.h:27:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/Renderer.h:32:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:19:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:38:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h:68:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/MacTypes.h:90:17: note: expanded from macro 'nil'
    #define nil NULL
                ^
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:1:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/SpiritTest_Prefix.pch:6:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/Cinder.h:92:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/chrono:280:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/type_traits:203:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cstddef:44:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/5.1/include/stddef.h:72:18: note: expanded from macro 'NULL'
#    define NULL __null
                 ^
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:9:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.h:12:
In file included from ../../../Cinder/boost/boost/spirit/include/qi.hpp:16:
In file included from ../../../Cinder/boost/boost/spirit/home/qi.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/action.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/action/action.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/qi/meta_compiler.hpp:14:
In file included from ../../../Cinder/boost/boost/spirit/home/support/meta_compiler.hpp:19:
In file included from ../../../Cinder/boost/boost/proto/proto.hpp:12:
In file included from ../../../Cinder/boost/boost/proto/core.hpp:21:
In file included from ../../../Cinder/boost/boost/proto/fusion.hpp:22:
In file included from ../../../Cinder/boost/boost/fusion/include/intrinsic.hpp:10:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/back.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/end.hpp:17:
In file included from ../../../Cinder/boost/boost/fusion/sequence/intrinsic/detail/segmented_end.hpp:11:
In file included from ../../../Cinder/boost/boost/fusion/iterator/segmented_iterator.hpp:10:
In file included from ../../../Cinder/boost/boost/fusion/iterator/detail/segmented_iterator.hpp:18:
../../../Cinder/boost/boost/fusion/iterator/detail/segmented_equal_to.hpp:16:5: error: declaration of anonymous struct must be a definition
    struct nil;
    ^
../../../Cinder/boost/boost/fusion/iterator/detail/segmented_equal_to.hpp:16:5: warning: declaration does not declare anything [-Wmissing-declarations]
    struct nil;
    ^~~~~~
../../../Cinder/boost/boost/fusion/iterator/detail/segmented_equal_to.hpp:35:43: error: expected unqualified-id
        struct segmented_equal_to<fusion::nil, fusion::nil>
                                          ^
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/Syntax.cpp:1:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/SpiritTest_Prefix.pch:8:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/AppBasic.h:27:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/App.h:27:
In file included from /Users/timmb/Documents/Programming/demos/SpiritTest/xcode/../../../Cinder/include/cinder/app/Renderer.h:32:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:19:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:38:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h:68:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/MacTypes.h:90:17: note: expanded from macro 'nil'
    #define nil NULL

有人能发现我做错了吗？

（顺便说一句，由于外部库的要求，我使用的是Boost 1.53。）

Answer 1

好像你错过了一些

包括（用于语义操作）

#include <boost/spirit/include/phoenix.hpp>

命名空间别名

namespace ascii = boost::spirit::ascii;

使用陈述/限定词

    using qi::_val;
    using qi::_1;
    using qi::_2;

查看 Live On Coliru

另请注意[_val = _1]是冗余的（自动属性传播实现相同）。

#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix.hpp>

namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::ascii;

template <typename Iterator>
struct ExpressionGrammer : qi::grammar<Iterator, double(), ascii::space_type>
{
    qi::rule<Iterator, double(), ascii::space_type> expression;
    qi::rule<Iterator, double(), ascii::space_type> addsub;

    ExpressionGrammer()
    : ExpressionGrammer::base_type(expression)
    {
        using qi::lit;
        using qi::_val;
        using qi::_1;
        using qi::_2;

        addsub = (expression >> '+' >> expression)[_val = _1 + _2];     
        expression = (addsub | qi::double_)[_val = _1];
    }
};

int main()
{
    ExpressionGrammer<char*> g;
}

错误编译非常简单的boost :: spirit语法

1 个答案: