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operator<<(std::basic_string_view)

运算符<%28std：：basic[医]弦[医]视图%29

Defined in header ​​
template <class CharT, class Traits> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, std::basic_string_view <CharT, Traits> v​(since C++17)

表现为FormattedOutputFunction.在构造和检查哨兵对象之后，确定输出格式填充如下：

A%29如果v.size()不少于os.width()，使用范围[v.begin(), v.end())否则为b%29，则为(os.flags() & ios_base::adjustfield) == ios_base::left、地点os.width()-v.size()的副本os.fill()字符序列c%29之后的字符，否则，放置os.width()-v.size()的副本os.fill()字符序列之前的字符

然后存储结果序列%28中的每个字符v加上将%29填充到输出流os好像通过打电话os.rdbuf()->sputn(seq, n)，在哪里n=std::max(os.width(), str.size())...

最后，呼叫os.width(0)取消…的影响std::setw如果有的话。

例外

可抛std::ios_base::failure如果在输出期间抛出异常。

参数

os-a character output stream
v-the view to be inserted

返回值

os...

另见

operator<>performs stream input and output on strings (function template)

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