Change to C++ 14

Author: kklamberty

.github/workflows/arraymerge_gtest.yml

@@ -34,7 +34,7 @@ jobs:
     - name: Check out the code
       uses: actions/checkout@v2
     - name: Compile test code
-      run: g++ -Wall -g -o array_merge_test ../mergesort/mergesort.c array_merge.c array_merge_test.cpp -lgtest -pthread -std=c++0x
+      run: g++ -Wall -g -o array_merge_test ../mergesort/mergesort.c array_merge.c array_merge_test.cpp -lgtest -pthread -std=c++14
       working-directory: array_merge
     - name: Run test
       run: ./array_merge_test

.github/workflows/arraymerge_test_valgrind.yml

@@ -36,7 +36,7 @@ jobs:
     - name: Check out the code
       uses: actions/checkout@v2
     - name: Compile code
-      run: g++ -Wall -g -o array_merge_test ../mergesort/mergesort.c array_merge.c array_merge_test.cpp -lgtest -pthread -std=c++0x
+      run: g++ -Wall -g -o array_merge_test ../mergesort/mergesort.c array_merge.c array_merge_test.cpp -lgtest -pthread -std=c++14
       working-directory: array_merge
     - name: Run test
       run: valgrind -v --leak-check=full --show-leak-kinds=all --error-exitcode=1 ./array_merge_test

.github/workflows/mergesort_gtest.yml

@@ -32,7 +32,7 @@ jobs:
     - name: Check out the code
       uses: actions/checkout@v2
     - name: Compile test code
-      run: g++ -Wall -g -o mergesort_test mergesort.c mergesort_test.cpp -lgtest -pthread -std=c++0x
+      run: g++ -Wall -g -o mergesort_test mergesort.c mergesort_test.cpp -lgtest -pthread -std=c++14
       working-directory: mergesort
     - name: Run test
       run: ./mergesort_test

.github/workflows/mergesort_test_valgrind.yml

@@ -34,7 +34,7 @@ jobs:
     - name: Check out the code
       uses: actions/checkout@v2
     - name: Compile code
-      run: g++ -Wall -g -o mergesort_test mergesort.c mergesort_test.cpp -lgtest -pthread -std=c++0x
+      run: g++ -Wall -g -o mergesort_test mergesort.c mergesort_test.cpp -lgtest -pthread -std=c++14
       working-directory: mergesort
     - name: Run test
       run: valgrind -v --leak-check=full --show-leak-kinds=all --error-exitcode=1 ./mergesort_test