类似的功能在C ++到Python的strip（）？ [英] Similar function in C++ to Python's strip()?

问题描述

Python中有一个非常有用的函数，名为 strip（） 。任何类似的C ++？

There is a very useful function in Python called strip(). Any similar ones in C++?

推荐答案

我过去使用类似下面的东西：

There's nothing built-in; I used to use something like the following:

template <std::ctype_base::mask mask>
class IsNot
{
    std::locale myLocale;       // To ensure lifetime of facet...
    std::ctype<char> const* myCType;
public:
    IsNot( std::locale const& l = std::locale() )
        : myLocale( l )
        , myCType( &std::use_facet<std::ctype<char> >( l ) )
    {
    }
    bool operator()( char ch ) const
    {
        return ! myCType->is( mask, ch );
    }
};

typedef IsNot<std::ctype_base::space> IsNotSpace;

std::string
trim( std::string const& original )
{
    std::string::const_iterator right = std::find_if( original.rbegin(), original.rend(), IsNotSpace() ).base();
    std::string::const_iterator left = std::find_if(original.begin(), right, IsNotSpace() );
    return std::string( left, right );
}

（我现在有一个显着更复杂的
版本，正确处理UTF-8。）

which works pretty well. (I now have a significantly more complex version which handles UTF-8 correctly.)

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