operator<= <regex>

2013-02-24

各种对象的小于或等于比较。

template<class BidIt>
    bool operator<=(const sub_match<BidIt>& left,
        const sub_match<BidIt>& right);
template<class BidIt, class IOtraits, class Alloc>
    bool operator<=(
        const basic_string<typename iterator_traits<BidIt>::value_type, IOtraits, Alloc>& left,
        const sub_match<BidIt>& right);
template<class BidIt, class IOtraits, class Alloc>
    bool operator<=(const sub_match<BidIt>& left,
        const basic_string<typename iterator_traits<BidIt>::value_type, IOtraits, Alloc>& right);
template<class BidIt>
    bool operator<=(const typename iterator_traits<BidIt>::value_type *left,
        const sub_match<BidIt>& right);
template<class BidIt>
    bool operator<=(const sub_match<BidIt>& left,
        const typename iterator_traits<BidIt>::value_type *right);
template<class BidIt>
    bool operator<=(const typename iterator_traits<BidIt>::value_type& left,
        const sub_match<BidIt>& right);
template<class BidIt>
    bool operator<=(const sub_match<BidIt>& left,
        const typename iterator_traits<BidIt>::value_type& right);

参数

BidIt
迭代器类型。
IOtraits
字符串特征选件类。
Alloc
分配器选件类。
left
比较左侧的对象。
right
比较的正确的对象。

备注

每个模板运算符返回 !(right < left)。

示例

// std_tr1__regex__operator_le.cpp 
// compile with: /EHsc 
#include <regex> 
#include <iostream> 
 
typedef std::cmatch::string_type Mystr; 
int main() 
    { 
    std::regex rx("c(a*)|(b)"); 
    std::cmatch mr; 
 
    std::regex_search("xcaaay", mr, rx); 
 
    std::csub_match sub = mr[1]; 
    std::cout << "sub == " << sub << std::endl; 
    std::cout << std::endl; 
 
    std::cout << "sub <= sub == " << std::boolalpha 
        << (sub <= sub) << std::endl; 
 
    std::cout << "string(\"aab\") <= sub == " << std::boolalpha 
        << (Mystr("aab") <= sub) << std::endl; 
    std::cout << "sub <= string(\"aab\") == " << std::boolalpha 
        << (sub <= Mystr("aab")) << std::endl; 
 
    std::cout << "\"aab\" <= sub == " << std::boolalpha 
        << ("aab" <= sub) << std::endl; 
    std::cout << "sub <= \"aab\" == " << std::boolalpha 
        << (sub <= "aab") << std::endl; 
 
    std::cout << "'a' <= sub == " << std::boolalpha 
        << ('a' <= sub) << std::endl; 
    std::cout << "sub <= 'a' == " << std::boolalpha 
        << (sub <= 'a') << std::endl; 
 
    return (0); 
    }