std::filesystem::path::append, std::filesystem::path::operator/=
From cppreference.com
< cpp | filesystem | path
path& operator/=(const path& p);
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(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) First, appends the preferred directory separator to this, except if any of the following conditions is true:
* the separator would be redundant (*this already ends with a separator)
* *this is empty, or adding it would turn a relative path to an absolute path in some other way
*
p
is an empty path.
* p.native() begins with a directory separator.
Then, appends p.native() to the pathname maintained by *this
2,3) Same as (1), but accepts any std::basic_string, null-terminated multicharacter string, or an input iterator pointing to a null-terminated multicharacter sequence.
4) Same as (1), but accepts any iterator pair that designates a multicharacter string.
Contents |
[edit] Parameters
p | - | pathname 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 InputIterator s that specify a multicharacter sequence that represents a path name
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Type requirements | ||
-
InputIt must meet the requirements of InputIterator .
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-The value type of InputIt must be one of the encoded character types (char, wchar_t, char16_t and char32_t)
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[edit] Return value
*this
[edit] Exceptions
May throw filesystem_error on underlying OS API errors or std::bad_alloc if memory allocation fails.
[edit] Example
Run this code
#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'; }
Possible output:
"C:" / "Users" == "C:Users" "C:" / "Users" / "batman" == "C:Users\batman"
[edit] See also
concatenates two paths without introducing a directory separator (public member function) |
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concatenates two paths with a directory separator (function) |