std::filesystem::path::replace_extension

path& replace_extension( const path& replacement = path() );

Replaces the extension with replacement or removes it when the default value of replacement is used.

Firstly, if this path has an extension(), it is removed from the generic-format view of the pathname.

Then, a dot character is appended to the generic-format view of the pathname, if replacement is not empty or does not begin with a dot character.

Then replacement is appended as if by operator+=(replacement).

Parameters

Return value

*this.

Exceptions

(none).

Notes

The type of replacement is std::filesystem::path even though it is not intended to represent an object on the file system in order to correctly account for the filesystem character encoding.

Example

#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
 
int main()
{
    fs::path p = "/foo/bar.jpeg";
    std::cout << "Was: " << p << '\n';
    p.replace_extension(".jpg");
    std::cout << "Now: " << p << '\n';
}

Was: "/foo/bar.jpeg"
Now: "/foo/bar.jpg"

See also