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std::basic_string::capacity

性病：基本[医]字符串：：能力

size_type capacity() const;​​

返回字符串当前为其分配空间的字符数。

参数

%280%29

返回值

当前分配的存储空间的容量。

例外

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

复杂性

常量。

例

二次

#include <iostream>
#include <string>
 
void show_capacity(std::string const& s)
{
    std::cout << "'" << s << "' has capacity " << s.capacity() << ".\n";
}
 
int main()
{
    std::string s{"Exemplar"};
    show_capacity(s
 
    s += " is an example string.";
    show_capacity(s
}

二次

可能的产出：

二次

'Exemplar' has capacity 8.
'Exemplar is an example string.' has capacity 30.

二次

另见

sizelengthreturns the number of characters (public member function)
reservereserves storage (public member function)

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