Boost库格式；得到std :: string [英] Boost Library Format; getting std::string

问题描述

我想添加一些我使用boost库格式化的字符串，如下所示:

I want to add some string which I format using the boost library as follows

boost::container::vector<std::string> someStringVector;
someStringVector.push_back(
    format("after is x:%f y:%f and before is x:%f y:%f\r\n") % 
    temp.x %
    temp.y %
    this->body->GetPosition().x %
    this->body->GetPosition().y;

编译器抱怨它不能转换类型，我尝试将.str()附加到返回的格式的末尾，但是它仍然抱怨.

The compiler is complaining that it can't convert types, and I tried appending .str() to the end of what format returns, but it still complained.

我收到的错误消息是:

error C2664: 'void boost::container::vector<T>::push_back(
  const std::basic_string<_Elem,_Traits,_Ax> &)' :
  cannot convert parameter 1 from
    'boost::basic_format<Ch>' to 
    'const std::basic_string<_Elem,_Traits,_Ax> &'

有人有见识吗?

推荐答案

您需要将格式包装在对boost :: str的调用中，就像这样:

You need to wrap the format in a call to boost::str, like so:

str( format("after is x:%f y:%f and before is x:%f y:%f\r\n")
     % temp.x % temp.y % this->body->GetPosition().x % this->body->GetPosition().y)

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