fix(examples): ignore unused structured bindings

GCC7 is the only compiler that has a warning for unused returned values of structured bindings

Author: alandefreitas

examples/annotations/textarrow/textarrow_1.cpp

@@ -5,7 +5,7 @@ int main() {
     using namespace matplot;
 
     plot(iota(1, 10));
-    auto [t, a] = textarrow(2.5, 6.5, 5, 5, "y=x");
+    textarrow(2.5, 6.5, 5, 5, "y=x");
 
     show();
     return 0;

examples/appearance/multiplot/subplot/subplot_13.cpp

@@ -5,6 +5,8 @@ int main() {
 
     auto ax1 = subplot(2, 1, 0);
     auto [x, y, z] = peaks();
+    (void) x;
+    (void) y;
     z = transpose(z);
     plot(ax1, z);
     xlim(ax1, {0, 20});

examples/data_distribution/parallelplot/parallelplot_3.cpp

@@ -7,6 +7,7 @@ int main() {
     X[0] = randn(100, 50, 200);
     X[1] = transform(X[0], [](double x) { return x + rand(-30, +30); });
     X[2] = transform(X[0], [](double x) { return x > 50 ? +1. : -1.; });
+    X[3].resize(X[0].size());
     std::generate(X[3].begin(), X[3].end(),
                   []() { return cos(rand(-30, +30)); });
 

examples/data_distribution/plotmatrix/plotmatrix_4.cpp

@@ -9,10 +9,9 @@ int main() {
                                           randn(100, 0, 1)};
 
     auto [S, H, axs] = plotmatrix(X);
+    (void) H;
     S[2][0]->color("g");
     S[2][0]->marker("*");
-    H[2]->edge_color("k");
-    H[2]->face_color("g");
     axs[0][1]->title("A Comparison of Data Sets");
 
     show();

examples/data_distribution/wordcloud/CMakeLists.txt

@@ -2,3 +2,6 @@ add_matplot_example(example_wordcloud_1 wordcloud_1.cpp)
 add_matplot_example(example_wordcloud_2 wordcloud_2.cpp)
 add_matplot_example(example_wordcloud_3 wordcloud_3.cpp)
 add_matplot_example(example_wordcloud_4 wordcloud_4.cpp)
+
+configure_file(shakespeare_sonnets.txt shakespeare_sonnets.txt COPYONLY)
+configure_file(en_blacklist.txt en_blacklist.txt COPYONLY)

examples/exporting/save/save_3.cpp

@@ -12,6 +12,7 @@ int main() {
 
     const auto &m = backend::gnuplot::extension_terminal();
     for (const auto &[extension, format] : m) {
+        (void) extension;
         save(std::string("formats/barchart ") + std::string(format),
              std::string(format));
     }

examples/geography/geoplot/geoplot_6.cpp

@@ -54,6 +54,8 @@ void eurotrip_solver::setup_starting_point(size_t iteration) {
     if (iteration < names_.size()) {
         auto [lon_ignore, lat_ignore, tour] =
             greedy_tsp_with_idx(lon_, lat_, iteration);
+        (void) lon_ignore;
+        (void) lat_ignore;
         curr_tour_ = tour;
         curr_dist_ = tour_distance(curr_tour_);
     } else {

examples/geography/geoplot/geoplot_7.cpp

@@ -59,6 +59,8 @@ void americas_trip_solver::setup_starting_point(size_t iteration) {
     if (iteration < names_.size()) {
         auto [lon_ignore, lat_ignore, tour] =
             greedy_tsp_with_idx(lon_, lat_, iteration);
+        (void) lon_ignore;
+        (void) lat_ignore;
         curr_tour_ = tour;
         curr_dist_ = tour_distance(curr_tour_);
     } else {

examples/images/imshow/CMakeLists.txt

@@ -8,4 +8,10 @@ add_matplot_example(example_imshow_7 imshow_7.cpp)
 add_matplot_example(example_imshow_8 imshow_8.cpp)
 add_matplot_example(example_imshow_9 imshow_9.cpp)
 add_matplot_example(example_imshow_10 imshow_10.cpp)
-add_matplot_example(example_imshow_11 imshow_11.cpp)
+add_matplot_example(example_imshow_11 imshow_11.cpp)
+
+file(GLOB ALL_EXAMPLE_IMGS lena_*)
+foreach (EXAMPLE_IMG ${ALL_EXAMPLE_IMGS})
+    get_filename_component(EXAMPLE_IMG_NAME ${EXAMPLE_IMG} NAME)
+    configure_file(${EXAMPLE_IMG_NAME} ${EXAMPLE_IMG_NAME} COPYONLY)
+endforeach ()

examples/surfaces/meshz/meshz_2.cpp

@@ -6,6 +6,7 @@ int main() {
     auto [X, Y] = meshgrid(iota(-3, .125, 3));
     auto Z = peaks(X, Y);
     auto [FX, FY] = gradient(Z);
+    (void) FY;
     meshz(X, Y, Z, FX);
     colorbar();