std :: to_string，boost :: to_string和boost :: lexical_cast< std :: string>之间有什么区别? [英] What's the difference between std::to_string, boost::to_string, and boost::lexical_cast<std::string>?

问题描述

boost::to_string(在boost/exception/to_string.hpp中找到)的用途是什么，它与boost::lexical_cast<std::string>和std::to_string有何区别?

What's the purpose of boost::to_string (found in boost/exception/to_string.hpp) and how does it differ from boost::lexical_cast<std::string> and std::to_string?

推荐答案

std::to_string (自C ++ 11起可用)专门用于基本数字类型.它还具有 std::to_wstring 变体.

std::to_string, available since C++11, works on fundamental numeric types specifically. It also has a std::to_wstring variant.

它旨在产生与 sprintf 会.

It is designed to produce the same results that sprintf would.

您可以选择此表单，以避免依赖于外部库/标题.

You may choose this form to avoid dependencies on external libraries/headers.

失败引发函数 boost::lexical_cast<std::string> 及其非投掷表亲

The throw-on-failure function boost::lexical_cast<std::string> and its non-throwing cousin boost::conversion::try_lexical_convert work on any type that can be inserted into a std::ostream, including types from other libraries or your own code.

针对常见类型存在优化的专业化，其通用形式类似于:

Optimized specializations exist for common types, with the generic form resembling:

template< typename OutType, typename InType >
OutType lexical_cast( const InType & input ) 
{
    // Insert parameter to an iostream
    std::stringstream temp_stream;
    temp_stream << input;

    // Extract output type from the same iostream
    OutType output;
    temp_stream >> output;
    return output;
}

您可以选择这种形式，以在通用函数中利用输入类型的更大灵活性，或者从您知道不是基本数字类型的类型中产生std::string.

You may choose this form to leverage greater flexibility of input types in generic functions, or to produce a std::string from a type that you know isn't a fundamental numeric type.

boost::to_string没有直接记录，似乎主要供内部使用.其功能类似于lexical_cast<std::string>，而不是std::to_string.

boost::to_string isn't directly documented, and seems to be for internal use primarily. Its functionality behaves like lexical_cast<std::string>, not std::to_string.

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