libsigc++ implements a typesafe callback system for standard C++. It allows you to define signals and to connect those signals to any callback function, either global or a member function, regardless of whether it is static or virtual.
libsigc++ is used by gtkmm to wrap the GTK+ signal system. It does not depend on GTK+ or gtkmm.
See the libsigc++ web site
Distribution of library and components is under the LGPL as listed in the file COPYING. Examples and tests are Public Domain.
Compatible compilers must support C++17, such as the decltype(auto) specifier (from C++14) and std::invoke().
Whenever possible, you should use the official binary packages approved by the supplier of your operating system, such as your Linux distribution. For instance, Ubuntu Linux, Debian Linux and Fedora Linux have official libsigc++ packages.
Building from the libsigc++ release tarball is easier than building from git.
For instance:
$ ./configure --prefix=/usr/local
$ make
$ make installBuilding from git can be difficult so you should prefer building from a release tarball unless you need to work on the libsigc++ code itself.
To build from git you may use either the autotools build (used by most developers) or CMake (should work too).
You must have autotools properly installed (autoconf, automake, etc) and you will also need mm-common.
$ ./autogen.sh --prefix=/usr/local
$ make
$ make checkThe CMake build is not used very often by the libsigc++ developers, but it should work, and we would welcome improvements.
For instance:
$ mkdir libsigcplusplus_build
$ cd libsigcplusplus_build
$ cmake path/to/libsigcplusplus
$ make