std::experimental::filesystem::path::concat, std::experimental::filesystem::path::operator+=
From cppreference.com
< cpp | experimental | fs | path
| path& operator+=( const path& p ); |
(1) | (filesystem TS) |
| path& operator+=( const string_type& str ); |
(2) | (filesystem TS) |
| path& operator+=( const value_type* ptr ); |
(3) | (filesystem TS) |
| path& operator+=( value_type x ); |
(4) | (filesystem TS) |
| template< class Source > path& operator+=( const Source& source ); |
(5) | (filesystem TS) |
| template< class CharT > path& operator+=( CharT x ); |
(6) | (filesystem TS) |
| template< class Source > path& concat( const Source& source ); |
(7) | (filesystem TS) |
| template< class InputIt > path& concat( InputIterator first, InputIterator last ); |
(8) | (filesystem TS) |
Concatenates the current path and the argument
1) Concatenates *this and p in such a way that native() of the result is exactly original native() concatenated with p.native()
2) Same as (1), except the resulting native() is a concatenation of the original {native() and the string
str3) Same as (1), except the resulting native() is a concatenation of the original native() and the null-terminated string whose first character is pointed to by
ptr4) Same as (1), except the resulting native() is a concatenation of the original native() and the single character
x5) Same as (1), except the resulting native() is a concatenation of the original native() and the sequence (which may be in portable or native format) represented by
source, which may be std::basic_string, null-terminated multicharacter string, or an input iterator pointing to a null-terminated multicharacter sequence.6) Same as (4), except that character conversion may be performed
7) Same as (5)
8) Same as (5), except that the sequence is represented by any iterator pair that designates a multicharacter string.
Parameters
| p | - | path to append |
| str | - | string to append |
| ptr | - | pointer to the beginning of a null-terminated string to append |
| x | - | single character to append |
| source | - | std::basic_string, 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 LegacyInputIterators that specify a multicharacter sequence that represents a path name |
| Type requirements | ||
-InputIt must meet the requirements of LegacyInputIterator.
| ||
-The value type of InputIt must be one of the encoded character types (char, wchar_t, char16_t and char32_t)
| ||
-CharT must be one of the encoded character types (char, wchar_t, char16_t and char32_t)
| ||
Return value
*this
Exceptions
May throw filesystem_error on underlying OS API errors or std::bad_alloc if memory allocation fails.
Notes
Unlike with append() or operator/=, additional directory separators are never introduced.
Example
Run this code
#include <iostream> #include <experimental/filesystem> namespace fs = std::experimental::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'; }
Output:
"" + "var" == "var" "" + "var" + "lib" == "varlib"
See also
| appends elements to the path (public member function) | |
| concatenates two paths with a directory separator (function) |