fix: add functional library in detail/ttm.h. #31

	name: "Linux"

	on:
	push:
	branches:
	- main # Adjust this to your main branch name

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- name: Checkout Repository
	uses: actions/checkout@v2

	- name: Setup C++ Environment
	run: \|
	sudo apt update && sudo apt install -y g++ libomp-dev libopenblas-dev libmkl-dev intel-mkl python3-pip python3-virtualenv

	- name: Install Gtest
	run: \|
	git clone https://github.com/google/googletest.git
	cd googletest
	mkdir build
	cd build
	cmake .. -DBUILD_GMOCK=OFF
	make -j
	sudo make install

	- name: Git Clone TTM Repo
	run: \|
	cd ${GITHUB_WORKSPACE}
	git clone https://github.com/bassoy/ttm.git

	- name: Build and Run Tests (Intel MKL)
	run: \|
	cd ttm/test
	make clean && make -j BLAS_FLAG=MKL
	./bin/main

	- name: Build and Run Tests (OpenBLAS)
	run: \|
	cd ttm/test
	make clean && make -j BLAS_FLAG=OPENBLAS
	./bin/main

	- name: Build and Run Python Wrapper Tests (OpenBLAS)
	run: \|
	cd ttm/ttmpy
	virtualenv ~/env-ttm
	source ~/env-ttm/bin/activate
	pip install -e .
	cd tests
	python3 -m unittest discover -v
	deactivate

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