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std::basic_string::length

性病：基本[医]String：：size，std：：basic[医]字符串：长度

size_type size() const;​​
size_type length() const;​​

返回CharT字符串中的元素，即std::distance(begin(), end())...

参数

%280%29

返回值

的数目CharT字符串中的元素。

例外

(none)(until C++11)
noexcept specification: noexcept(since C++11)

复杂性

常量。

注记

为std::string，元素为字节%28类型的char%29对象，如果使用UTF-8等多字节编码，则这些对象与字符不同。

例

二次

#include <cassert>
#include <iterator>
#include <string>
 
int main()
{
    std::string s("Exemplar"
    assert(8 == s.size()
    assert(s.size() == s.length()
    assert(s.size() == static_cast<std::string::size_type>(
        std::distance(s.begin(), s.end()))
}

二次

另见

emptychecks whether the string is empty (public member function)
max_sizereturns the maximum number of characters (public member function)

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