sfl library

This is header-only C++11 library that offers several new or less-known containers.

Sequence containers:

• vector — Vector equivalent to std::vector, but not specialized for bool and with a few minor differences.
• devector — Double-ended vector that allows faster insertion and deletion at the front compared to vector.
• small_vector — Vector that embeds small statically allocated storage internally to avoid dynamic memory allocation when the number of elements is small.
• static_vector — Vector with a fixed maximum capacity defined at compile time, backed entirely by statically allocated storage. Dynamic memory is never used.
• compact_vector — Vector whose capacity() is always equal to its size(). Inspired by OpenFOAM's container List.
• segmented_vector — Vector with segmented storage that allows fast insertion and deletion at the back without memory reallocation.
• segmented_devector — Double-ended vector with segmented storage that allows fast insertion and deletion at both the front and back without memory reallocation.

Associative containers based on red-black trees:

• map
• set
• multimap
• multiset

• small_map
• small_set
• small_multimap
• small_multiset

• static_map
• static_set
• static_multimap
• static_multiset

Unordered associative containers based on hash tables with separate chaining:

• unordered_map
• unordered_set
• unordered_multimap
• unordered_multiset

• small_unordered_map
• small_unordered_set
• small_unordered_multimap
• small_unordered_multiset

• static_unordered_map
• static_unordered_set
• static_unordered_multimap
• static_unordered_multiset

Associative containers based on sorted vectors:

• flat_map
• flat_set
• flat_multimap
• flat_multiset

• small_flat_map
• small_flat_set
• small_flat_multimap
• small_flat_multiset

• static_flat_map
• static_flat_set
• static_flat_multimap
• static_flat_multiset

Unordered associative containers based on unsorted vectors:

• small_unordered_linear_map
• small_unordered_linear_set
• small_unordered_linear_multimap
• small_unordered_linear_multiset

• static_unordered_linear_map
• static_unordered_linear_set
• static_unordered_linear_multimap
• static_unordered_linear_multiset

Features

• Compiles with GCC 4.8.5 and Clang 3.4.2.
• Containers support stateful allocators and allocators with fancy pointers.
• Containers have available range constructor container(sfl::from_range_t, Range&& r) in C++11.
• Containers have available range insertion member function insert_range(Range&& r) in C++11.
• Maps and sets support heterogeneous insertion, erasure and lookup in C++11.
• Functions taking iterator range properly handle input iterators.
• There is no undefined behavior when constructing maps and sets from range containing duplicates.
• There is no undefined behavior when inserting range containing duplicates into maps and sets.
• Vectors are not specialized for bool.
• Static containers can be used for bare-metal embedded software development.

Requirements

This library requires C++11 compiler or newer. If available, library uses features of newer C++ standards.

Tested compilers:

• GCC 4.8.5 on CentOS 7 (C++11)
• Clang 3.4.2 on CentOS 7 (C++11)
• GCC 7.3.1 on CentOS 7 (C++11, 14, 17)
• Clang 5.0.1 on CentOS 7 (C++11, 14, 17)
• GCC 15.1.1 on Arch Linux (C++11, 14, 17, 20, 23)
• Clang 20.1.6 on Arch Linux (C++11, 14, 17, 20, 23)
• MSVC 19.38 (C++14, 17, 20, latest)

Installation and usage

Method 1: Manual copy-paste

Step 1: Copy sfl subdirectory from include into your project directory.

Step 2: Configure your project or compiler to search for include files in the directory containing sfl subdirectory.

Step 3: #include what you need.

Method 2: CMake integration

This library can be integrated into CMake project using CMake module FetchContent.

Step 1: Add the following lines into your CMakeLists.txt:

include(FetchContent)

FetchContent_Declare(
    sfl
    GIT_REPOSITORY https://github.com/slavenf/sfl-library)

FetchContent_MakeAvailable(sfl)

Step 2: Add this library as a dependency into your CMakeLists.txt::

target_link_libraries(your_target_name PRIVATE sfl)

Step 3: #include what you need.

Exceptions

This library by default throw exceptions in case of error.

If macro SFL_NO_EXCEPTIONS is defined then library avoids using exceptions and calls std::abort in case of error.

This library does not automatically detect whether the compiler is invoked with appropriate flag or not, like -fno-exceptions in GCC and Clang.

Debugging

This library extensively uses macro assert from header <cassert>.

The definition of the macro assert depends on another macro, NDEBUG, which is not defined by the standard library.

If macro NDEBUG is defined then assert does nothing.

If macro NDEBUG is not defined then assert performs check. If check fails, assert outputs implementation-specific diagnostic information on the standard error output and calls std::abort.

Detailed documentation

The detailed documentation is located in directory doc. The detailed documentation is handwritten in Markdown format, it is not automatically generated with tools like Doxygen, so there may be some errors or mistakes. If you find one, please report it.

Tests

Test programs and scripts are located in directory test.

Tested compilers are listed in section Requirements.

Each test program is checked with Valgrind tool.

License

Licensed under zlib license. The license text is in file LICENSE.txt.