std::filesystem::path::append
文件系统：：path：：append，std：：file system：：path：：Operator/=
| path& operator/=(const path& p | (1) | (since C++17) |
|---|---|---|
| template< class Source > path& operator/=( const Source& source | (2) | (since C++17) |
| template< class Source > path& append( const Source& source | (3) | (since C++17) |
| template< class InputIt > path& append( InputIt first, InputIt last | (4) | (since C++17) |
1%29首先，将首选目录分隔符追加到this，除非下列任何条件都是真实的：
%2A分离器将是多余的%28*this已经以分隔符%29结尾
%2A*this为空，或者添加它会以其他方式将相对路径转换为绝对路径。
%2Ap是一条空路。
%2Ap.native()从目录分隔符开始。
然后，追加p.native()维护的路径名。*this
如果p.has_root_name()是true...
2，3%29与%281%29相同，但接受任何std::basic_string，，，std::basic_string_view或指向空终止多字符序列的输入迭代器.。相当于return operator/=(path(source)...
4%29与%281%29相同，但接受指定多字符字符串的任何迭代器对。相当于return operator/=(path(first, last)
参数
| p | - | pathname to append |
|---|---|---|
| source | - | std::basic_string, std::basic_string_view, null-terminated multicharacter string, or an input iterator pointing to a null-terminated multicharacter sequence, which represents a path name (either in portable or in native format) |
| first, last | - | pair of InputIterators that specify a multicharacter sequence that represents a path name |
类型要求
-输入必须符合输入器的要求。
-InputIt的值类型必须是编码字符类型%28 char，wchar[医]T，char16[医]T和char32[医]t%29
返回值
*this...
例外
可抛filesystem_error关于基础OS API错误或std::bad_alloc如果内存分配失败。
例
二次
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main() {
fs::path p1 = "C:";
p1 /= "Users"; // does not insert a separator
std::cout << "\"C:\" / \"Users\" == " << p1 << '\n';
p1 /= "batman"; // inserts fs::path::preferred_separator, '\' on Windows
std::cout << "\"C:\" / \"Users\" / \"batman\" == " << p1 << '\n';
}
二次
可能的产出：
二次
"C:" / "Users" == "C:Users"
"C:" / "Users" / "batman" == "C:Users\batman"
二次
另见
| concatoperator+= | concatenates two paths without introducing a directory separator (public member function) |
|---|---|
| operator/ | concatenates two paths with a directory separator (function) |
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