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C++20 STL Cookbook

Use Manipulation Functions with Path

Explore how to manipulate path objects using C++20 filesystem functions, including concatenation, appending, and obtaining absolute and canonical paths. Understand error handling with filesystem_error and how to compare paths for equivalency across different platforms. This lesson equips you with practical skills for robust file system operations in modern C++.

We'll cover the following...

The filesystem library includes functions for manipulating the contents of path objects. In this recipe, we will consider a few of these tools.

How to do it

In this recipe, we examine some functions that manipulate the contents of path objects:

  • We start with the namespace directive and our formatter specialization. We do this in every recipe in this chapter:

namespace fs = std::filesystem;
template<>
struct std::formatter<fs::path>: std::formatter<std::string> {
    template<typename FormatContext>
    auto format(const fs::path& p, FormatContext& ctx) {
        return format_to(ctx.out(), "{}", p.string());
    }
};

  • We can get the current working directory with the current_path() function, which returns a path object:

cout << format("current_path: {}\n", fs::current_path());

Output:

current_path: /usr/include

  • The absolute() ...