无法在 boost 1.57 中编译 boost/any_iterator.hpp
在(尝试)升级 VS2012 项目以使用 boost 1.57 之后,我无法再编译――来自 boost/any_iterator.hpp
(见下文)的大量错误消息.作为测试,我创建了一个新项目,它只包含一个空的 main 函数和 #include "boost/any_iterator.hpp"
并得到了相同的错误集.这是它抱怨的代码:
After (attempting to) upgrade a VS2012 project to use boost 1.57, I can no longer compile--lots and lots of error messages coming out of boost/any_iterator.hpp
(see below). As a test, I created a new project that contained nothing but an empty main function and #include "boost/any_iterator.hpp"
and got the same set of errors. Here is the code it's complaining about:
// snippet from boost/any_iterator.hpp
template<
class Value
, class Traversal
, class Reference
, class Difference
, class Buffer
>
class postfix_increment_proxy<
range_detail::any_iterator< // line 131
Value
, Traversal
, Reference
, Difference
, Buffer
>
>
{
// ...
};
在同一个文件中有另一个类遵循相同的模式并产生相同的错误.range_detail::any_iterator
在文件中向前声明了一点:
There is another class in the same file that follows the same pattern and generates identical errors. range_detail::any_iterator
is forward-declared a little higher up in the file:
namespace range_detail
{
// ...
template<
class Value
, class Traversal
, class Reference
, class Difference
, class Buffer = any_iterator_default_buffer
>
class any_iterator;
// ...
}
就其价值而言,这是我从 VS2012 得到的一组错误:
For what it's worth, here's the set of errors I get from VS2012:
Error 1 error C2143: syntax error : missing ';' before '<' [path]oostangedetailany_iterator.hpp 131
Error 2 error C2059: syntax error : '<' [path]oostangedetailany_iterator.hpp 131
Error 3 error C2065: 'Value' : undeclared identifier [path]oostangedetailany_iterator.hpp 134
Error 4 error C2065: 'Traversal' : undeclared identifier [path]oostangedetailany_iterator.hpp 135
Error 5 error C2065: 'Reference' : undeclared identifier [path]oostangedetailany_iterator.hpp 136
Error 6 error C2065: 'Difference' : undeclared identifier [path]oostangedetailany_iterator.hpp 137
Error 7 error C2065: 'Buffer' : undeclared identifier [path]oostangedetailany_iterator.hpp 138
Error 8 error C2923: 'boost::range_detail::any_iterator' : 'Value' is not a valid template type argument for parameter 'Value' [path]oostangedetailany_iterator.hpp 138
Error 9 error C2923: 'boost::range_detail::any_iterator' : 'Traversal' is not a valid template type argument for parameter 'Traversal' [path]oostangedetailany_iterator.hpp 138
Error 10 error C2923: 'boost::range_detail::any_iterator' : 'Reference' is not a valid template type argument for parameter 'Reference' [path]oostangedetailany_iterator.hpp 138
Error 11 error C2923: 'boost::range_detail::any_iterator' : 'Difference' is not a valid template type argument for parameter 'Difference' [path]oostangedetailany_iterator.hpp 138
Error 12 error C2923: 'boost::range_detail::any_iterator' : 'Buffer' is not a valid template type argument for parameter 'Buffer' [path]oostangedetailany_iterator.hpp 138
Error 13 error C2143: syntax error : missing ';' before '{' [path]oostangedetailany_iterator.hpp 140
Error 14 error C2447: '{' : missing function header (old-style formal list?) [path]oostangedetailany_iterator.hpp 140
有人知道解决方法吗?
推荐答案
这似乎是 boost 代码库中的一个错误.postfix_increment_proxy
和 writable_postfix_increment_proxy
都在 boost::iterators::detail
命名空间 (iterator_facade.hpp) 中.但是,这两个名称在 any_iterator.hpp 中都未限定使用.在两个名称前添加 boost::iterators::detail::
允许代码编译.
This appears to be a bug in the boost codebase. postfix_increment_proxy
and writable_postfix_increment_proxy
are both in the boost::iterators::detail
namespace (iterator_facade.hpp). However, both names are used unqualified in any_iterator.hpp. Adding boost::iterators::detail::
in front of both names allows the code to compile.
对于那些对编辑 boost 代码的想法感到不舒服的人,包括 iterator_facade.hpp 后跟 using namespace boost::iterators::detail
后跟 any_iterator.hpp 的包含也可以解决问题以命名空间污染为代价.VS2012 不支持它们,所以它对我没有任何好处,但你大概也可以使用 C++11.
For anyone who's uncomfortable with the idea of editing boost code, including iterator_facade.hpp followed by using namespace boost::iterators::detail
followed by an include for any_iterator.hpp will also solve the problem at the cost of namespace pollution. VS2012 doesn't support them so it doesn't do me any good, but you could presumably use a C++11 using too.
提交的工单:https://svn.boost.org/trac/boost/ticket/10754
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