std::filesystem::relative, std::filesystem::proximate

 

C++

Language

Standard library headers

Concepts

Utilities library

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Iterators library

Numerics library

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Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Filesystem library

Classes
filesystem::path filesystem::filesystem_error filesystem::directory_entry filesystem::directory_iterator filesystem::recursive_directory_iterator filesystem::file_status	filesystem::space_info filesystem::file_type filesystem::perms filesystem::copy_options filesystem::directory_options filesystem::file_time_type
Functions
filesystem::absolute filesystem::system_complete filesystem::canonicalfilesystem::weakly_canonical filesystem::relativefilesystem::proximate filesystem::copy filesystem::copy_file filesystem::copy_symlink filesystem::create_directory filesystem::create_directories filesystem::create_hard_link filesystem::create_symlink filesystem::create_directory_symlink filesystem::current_path	filesystem::exists filesystem::equivalent filesystem::file_size filesystem::hard_link_count filesystem::last_write_time filesystem::permissions filesystem::read_symlink filesystem::remove filesystem::remove_all filesystem::rename filesystem::resize_file filesystem::space filesystem::status filesystem::symlink_status filesystem::temp_directory_path
File types
filesystem::is_block_file filesystem::is_character_file filesystem::is_directory filesystem::is_empty filesystem::status_known	filesystem::is_fifo filesystem::is_other filesystem::is_regular_file filesystem::is_socket filesystem::is_symlink

 

Defined in header <filesystem>
path relative( const std::filesystem::path& p,                std::error_code& ec);	(1)	(since C++17)
path relative( const std::filesystem::path& p,                const std::filesystem::path& base = std::filesystem::current_path()); path relative( const std::filesystem::path& p,                const std::filesystem::path& base,                std::error_code& ec);	(2)	(since C++17)
path proximate( const std::filesystem::path& p,                 std::error_code& ec);	(3)	(since C++17)
path proximate( const std::filesystem::path& p,                 const std::filesystem::path& base = std::filesystem::current_path()); path proximate( const std::filesystem::path& p,                 const std::filesystem::path& base,                 std::error_code& ec);	(4)	(since C++17)

1) Returns relative(p, current_path(), ec)

2) Returns p made relative to base. Resolves symlinks and normalizes both p and base before other processing. Effectively returns weakly_canonical(p).lexically_relative(weakly_canonical(base)) or weakly_canonical(p, ec).lexically_relative(weakly_canonical(base, ec)), except the error code form returns path() at the first error occurrence, if any.

3) Returns proximate(p, current_path(), ec)

4) Effectively returns weakly_canonical(p).lexically_proximate(weakly_canonical(base)) or weakly_canonical(p, ec).lexically_proximate(weakly_canonical(base, ec)), except the error code form returns path() at the first error occurrence, if any.

Parameters

p	-	an existing path
base	-	base path, against which p will be made relative/proximate
ec	-	error code to store error status to

Return value

1) p made relative against base.

2) p made proximate against base

Exceptions

The overload that does not take a std::error_code& parameter throws filesystem_error on underlying OS API errors, constructed with p as the first argument, base as the second argument, and the OS error code as the error code argument. std::bad_alloc may be thrown if memory allocation fails. The overload taking a std::error_code& parameter sets it to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. This overload has

noexcept specification:  

noexcept

  

See also

path (C++17)	represents a path (class)
absolutesystem_complete (C++17)(C++17)	composes an absolute path converts a path to an absolute path replicating OS-specific behavior (function)
canonicalweakly_canonical (C++17)	composes a canonical path (function)