20 Open Source Cpp98 Software Projects

A modern, C++-native, header-only, test framework for unit-tests, TDD and BDD - using C++11, C++14, C++17 and later (or C++03 on the Catch1.x branch)

A curated list of awesome header-only C++ libraries

gsl-lite – A single-file header-only version of ISO C++ Guidelines Support Library (GSL) for C++98, C++11, and later

A modern, C++11-native, single-file header-only, tiny framework for unit-tests, TDD and BDD (includes C++98 variant)

span lite - A C++20-like span for C++98, C++11 and later in a single-file header-only library

optional lite - A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library

string_view lite - A C++17-like string_view for C++98, C++11 and later in a single-file header-only library

variant lite - A C++17-like variant, a type-safe union for C++98, C++11 and later in a single-file header-only library

ring-span lite - A C++yy-like ring_span type for C++98, C++11 and later in a single-file header-only library

any lite - A C++17-like any, a type-safe container for single values of any type for C++98, C++11 and later in a single-file header-only library

c++ testing framework

std C++ 11 library impementation with extra features using only C++ 98 and POSIX threads

A tiny single-file header-only C++ logging framework

Parent of *-lite repositories, a migration path to post-C++11 features for pre-C++11 environments

byte lite - A C++17-like byte type for C++98, C++11 and later in a single-file header-only library

observer-ptr - An observer_ptr for C++98 and later in a single-file header-only library (Extensions for Library Fundamentals, v2, v3)

value-ptr-lite - A C++ smart-pointer with value semantics for C++98, C++11 and later in a single-file header-only library

Hazelcast IMDG C++ Client

A simple C++ header-only library for fastest sorting of small arrays. Generates sorting networks on compile time via templates.

Small C++ preprocessor library