C++ std的模糊过载：：ostream&；操作员<&书信电报；（标准：ostream&；sstr、const T&；val）

为了序列化任何对象（例如，对于没有全局

ostream&operatorprecode1>application\u src\general\u experiments.cpp（39）：错误C2593:“operator当重载解析到来时，编译器似乎将从
const char&
到
char
的转换放在与向上转换
std:：ostringstream
相同的级别上

解决方案可能是模板化
运算符的类型是。。。尽管这不是一个解决方案：（不起作用，编译器似乎优先于所有其他运算符
namespace _impl {
template <typename T>
std::ostream& operator<<(std::ostream& osstr, const T& val) {
  return osstr;
}
}

template <typename T>
std::string serialize_any(const T& val) {
  using namespace _impl;
  std::ostringstream osstr;
  osstr<< val;
  std::string str(osstr.str());
  return str;
}

1>application_src\general_experiments.cpp(39): error C2593: 'operator <<' is ambiguous
1>          application_src\general_experiments.cpp(26): could be 'std::ostream &_impl::operator <<<T>(std::ostream &,const T &)'
1>          with
1>          [
1>              T=char
1>          ]
1>          C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\ostream(914): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,_Elem)' [found using argument-dependent lookup]
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]
1>          C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\ostream(827): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]
1>          C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\ostream(742): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]
1>          while trying to match the argument list '(std::ostringstream, const char)'
1>          application_src\general_experiments.cpp(52) : see reference to function template instantiation 'std::string serialize_any<char>(const T &)' being compiled
1>          with
1>          [
1>              T=char
1>          ]
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

namespace _impl {
    template <typename T, typename Y>
    Y& operator<<(Y& osstr, const T& val) {
      return osstr;
    }
}