I have a certain boost::filesystem::path
in hand and I\'d like to append a string (or path) to it.
boost::filesystem::path p(\"c:\\\\dir\");
p.appen
You can define the +
operator yourself such that you can add two boost::filesystem::path
variables.
inline boost::filesystem::path operator+(boost::filesystem::path left, boost::filesystem::path right){return boost::filesystem::path(left)+=right;}
Then you can even add a std::string
variable (implicit conversion). This is similar to the definition of the operator/
from
include/boost/filesystem/path.hpp:
inline path operator/(const path& lhs, const path& rhs) { return path(lhs) /= rhs; }
Here is a working example:
main.cpp:
#include <iostream>
#include <string>
#include <boost/filesystem.hpp>
using namespace boost::filesystem;
inline path operator+(path left, path right){return path(left)+=right;}
int main() {
path p1 = "/base/path";
path p2 = "/add/this";
std::string extension=".ext";
std::cout << p1+p2+extension << '\n';
return 0;
}
compiled with
g++ main.cpp -lboost_system -lboost_filesystem
produces the output:
$ ./a.out
"/base/path/add/this.ext"
With Version 3 of Filesytem library (Boost 1.55.0) it's as easy as just
boost::filesystem::path p("one_path");
p += "_and_another_one";
resulting in p = "one_path_and_another_one"
.
#include <iostream>
#include <string>
#include <boost/filesystem.hpp>
int main() {
boost::filesystem::path p (__FILE__);
std::string new_filename = p.leaf() + ".foo";
p.remove_leaf() /= new_filename;
std::cout << p << '\n';
return 0;
}
Tested with 1.37, but leaf and remove_leaf are also documented in 1.35. You'll need to test whether the last component of p is a filename first, if it might not be.
path p;
std::string st = "yoo";
p /= st + ".foo";
If it's really just the file name extension you want to change then you are probably better off writing:
p.replace_extension(".foo");
for most other file path operations you can use the operators /=
and /
allowing to concatenate parts of a name. For instance
boost::filesystem::path p("c:\\dir");
p /= "subdir";
will refer to c:\dir\subdir
.