C中的std :: string是否有内置函数,当字符串可以是大写或小写时,按字母顺序比较两个字符串？

std::string a("Hello");
std::string b("HelLO");
std::cout << std::equal(a.begin(),a.end(),b.begin(),[] (const char& a,const char& b)
    {
        return (std::tolower(a) == std::tolower(b));
    });@H_262_15@ 
 
有关考虑区域设置的解决方案,请参阅Case insensitive std::string.find().
 
  
 
#include <locale>

template<typename charT = std::string::value_type>
struct my_equal {
    my_equal( const std::locale& loc ) : loc_(loC) {}
    bool operator()(charT ch1,charT ch2) {
        return std::toupper(ch1,loc_) == std::toupper(ch2,loc_);
    }
private:
    const std::locale& loc_;
};

int main()
{
    std::string a("Hello");
    std::string b("HelLO");
    std::cout << std::equal(a.begin(),my_equal<>(std::locale()));
}@H_262_15@