added workflows

.github/workflows/clang-format-check.yml

@@ -0,0 +1,24 @@
+name: clang-format Check
+on:
+  push:
+    branches: [ "main", "cleanup" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  formatting-check:
+    name: Formatting Check
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        path:
+          - 'src'
+          - 'test'
+    steps:
+    - uses: actions/checkout@v3
+    - name: Run clang-format style check for C/C++/Protobuf programs.
+      uses: jidicula/[email protected]
+      with:
+        clang-format-version: '16'
+        check-path: ${{ matrix.path }}
+        fallback-style: 'LLVM' # optional

.github/workflows/cpp-linux-build.yml

@@ -0,0 +1,42 @@
+name: Linux CI build
+
+on:
+  push:
+    branches: [ "main", "cleanup" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: install scons
+      run: sudo apt-get install -y scons
+
+    - name: install (latest) eigen
+      run: sudo apt install libeigen3-dev
+
+    - name: build (production), gcc
+      run: scons
+
+    - name: build (production, c++20), gcc
+      run: scons --std=20
+
+    - name: build (debug), gcc
+      run: scons debug=1
+
+    - name: build (debug & tests), gcc
+      run: scons debug=1 test=1
+
+    - name: build (production), clang
+      run: scons --cxx=clang++
+
+    - name: build (debug & tests), clang
+      run: scons debug=1 test=1 --cxx=clang++
+
+    - name: build (production, C++20), clang
+      run: scons --cxx=clang++ --std=20

README.md

@@ -1,13 +1,8 @@
 # C++ Datetime library
 
-[![Build Status](https://app.travis-ci.com/xanthospap/ggdatetime.svg?branch=master)](https://app.travis-ci.com/xanthospap/ggdatetime)
-[![Total alerts](https://img.shields.io/lgtm/alerts/g/xanthospap/ggdatetime.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/xanthospap/ggdatetime/alerts/)
-[![Language grade: C/C++](https://img.shields.io/lgtm/grade/cpp/g/xanthospap/ggdatetime.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/xanthospap/ggdatetime/context:cpp)
-
-
 ## Introduction
 
-ggdatetime is a C++ library to assist date and time - related computations in 
+ggdatetime is a C++ library to assist date and time related computations in 
 Geodesy related fields.
 
 ## Compilation / Installation
@@ -17,70 +12,47 @@ Source code is ISO C++17. Compilation should be trivial using any C++ compiler
 standard (option `-std=c++17` in gcc and clang).
 
 **October 2021** Source code can also be compiled using the latest 
-[C++ 20 standard](https://en.cppreference.com/w/cpp/20). To compile against
-C++20, set the corresponding flags in the `Makefile.am` files.
+[C++ 20 standard](https://en.cppreference.com/w/cpp/20). 
 
 > Since December 2021, the build system has been changed from 
 > [GNU Autotools](https://www.gnu.org/software/automake/manual/html_node/Autotools-Introduction.html)
 > to [scons](https://scons.org/). 
 
-**April 2022** Building with Autotools is now deprecated and not supported.
-
-For the following, `ROOTDIR` will be the root directory of this repository,
-aka the directory under which `/src`, `/test` and `/doc` folders live.
-
 ### Compile and install
+
 To compile and install, using [scons](https://scons.org/), just type:
 ```
+# compile
 scons
+# install (system-wide)
 sudo scons install
 ```
 
-## Verify & Test
-
-After a succesefull installation, users should have:
-
-1. all library header files in `/usr/local/include/datetime/`
-2. the library (both a static and shared) in `/usr/local/lib/`
-
-~~To run a validity check, just run: `make check` at the root directory. Hopefully, 
-you 'll see all checks passing!~~
+## Examples
 
-**__The following step is optional__**
-A validation test script (kind of unit-testing) can be run to check that the library 
-works as expected. You do not need to have the library installed on your system to 
-perform the check (aka the step `sudo make install` is not needed) you only need to 
-have it compiled (aka `make` should be successeful). If you built the library in 
-a seperate folder you may need to edit the script, because it assumes that the 
-(newly compiled) library is located in `ROOTDIR/src/.libs` witch is the default case.
-The validation script can be found is [make_unit_tests.sh](https://github.com/xanthospap/ggdatetime/blob/master/var/make_unit_tests.sh) 
-and to run it (assuming you are in `ROOTDIR`):
-`cd var && bash make_unit_tests.sh`. The script will use a number of source files 
-located in the [ROOT/var](https://github.com/xanthospap/ggdatetime/blob/master/var/) folder 
-to check the compile-ibility of the sources and the reported results. At the end 
-of the report, you should see the meesage: `Everything appears to have worked as expected!`
+Consult the test programs source code in the 
+[test folder](https://github.com/xanthospap/libsinex/tree/main/test) 
+for examples on how to use the library.
 
-Link, include and have fun!
+## Developers
 
-## The Library
+Take a look at the [LLVM Coding Standards](https://llvm.org/docs/CodingStandards.html) 
+and if possible stick to it. 
 
-### Namespaces
+Use [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
+to format you code before commiting; if you try to commit with non-acceptable 
+code format, the CI system will fail.
 
-The whole of the library is wrapped around the `dso` namespace
+### Testing
 
-### Linking
-
-- static
-- dynamic
-
-## Documentation & Library API (TODO)
-
-- build dox with doxygen (or link to dox)
-
-## TODO
-
-## Bugs & Maintanance
-Xanthos, [email protected]
-Mitsos, [email protected]
-
-## FAQ
+Test source code is found in [test folder](test). 
+To automatically run all tests, use the Python script 
+[run_test_suite.py](run_test_suite.py). 
+Note that to be able to run the scipt, you will have to compile using the 
+`test=1` option, i.e.
+```
+## build project and tests
+scons test=1
+## run tests
+./run_test_suite.py --progs-dir=test
+```

SConstruct

@@ -54,8 +54,8 @@ lib_src_files = glob.glob(r"src/*.cpp")
 hdr_src_files = glob.glob(r"src/*.hpp")
 
 ## Environments ...
-denv = Environment(CXXFLAGS='-std=c++17 -g -pg -Wall -Wextra -Werror -pedantic -W -Wshadow -Winline -Wdisabled-optimization -DDEBUG')
-penv = Environment(CXXFLAGS='-std=c++17 -Wall -Wextra -Werror -pedantic -W -Wshadow -Winline -O2 -march=native')
+denv = Environment(CXXFLAGS='-g -pg -Wall -Wextra -Werror -pedantic -W -Wshadow -Winline -Wdisabled-optimization -DDEBUG')
+penv = Environment(CXXFLAGS='-Wall -Wextra -Werror -pedantic -W -Wshadow -Winline -O2 -march=native')
 
 ## Command line arguments ...
 debug = ARGUMENTS.get('debug', 0)

src/dtconcepts.hpp

@@ -2,6 +2,9 @@
 #define __DSO_DATETIME_CONCEPTS20_HPP__
 
 #if __cplusplus >= 202002L /* concepts only available in C++20 */
+
+#include <type_traits>
+
 namespace dso {
 namespace gconcepts {