std::filesystem::path::operator+=
文件系统：：path：：conat，std：：file system：：path：：Operator+=
| path& operator+=( const path& p | (1) | (since C++17) |
|---|---|---|
| path& operator+=( const string_type& str path& operator+=( std::basic_string_view<value_type> str | (2) | (since C++17) |
| path& operator+=( const value_type* ptr | (3) | (since C++17) |
| path& operator+=( value_type x | (4) | (since C++17) |
| template< class Source > path& operator+=( const Source& source | (5) | (since C++17) |
| template< class CharT > path& operator+=( CharT x | (6) | (since C++17) |
| template< class Source > path& concat( const Source& source | (7) | (since C++17) |
| template< class InputIt > path& concat( InputIterator first, InputIterator last | (8) | (since C++17) |
连接当前路径和参数。
1%29名Concatenates*this和p以这样的方式本地人%28%29结果完全是原创的本地人%28%29与...连在一起p.native()
2%29与%281%29相同，但结果除外本地人%28%29是原始{的连接。本地人%28%29和字符串%28或字符串视图%29str
3%29与%281%29相同，但结果除外本地人%28%29是原本地人%28%29和第一个字符指向的以空结尾的字符串。ptr
4%29与%281%29相同，但结果除外本地人%28%29是原本地人%28%29和单字x
5%29与%281%29相同，但结果除外本地人%28%29是原本地人%28%29和序列%28，该序列可以是可移植的或本机格式的%29，所表示的source，这可能是std::basic_string，，，std::basic_string_view或指向空终止多字符序列的输入迭代器.
6%29与%284%29相同，但可以执行字符转换
7%29与%285%29
8%29与%285%29相同，但该序列由指定多字符字符串的任何迭代器对表示。
参数
| p | - | path to append |
|---|---|---|
| str | - | string or string view to append |
| ptr | - | pointer to the beginning of a null-terminated string to append |
| x | - | single character 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
图表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。
注记
不像append()或operator/=，则从不引入附加的目录分隔符。
例
二次
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main() {
fs::path p1; // empty path
p1 += "var"; // does not insert a separator
std::cout << "\"\" + \"var\" == " << p1 << '\n';
p1 += "lib"; // does not insert a separator
std::cout << "\"\" + \"var\" + \"lib\" == " << p1 << '\n';
}
二次
产出：
二次
"" + "var" == "var"
"" + "var" + "lib" == "varlib"
二次
另见
| appendoperator/= | appends elements to the path with a directory separator (public member function) |
|---|---|
| operator/ | concatenates two paths with a directory separator (function) |
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