examples: fix segfault on exit with python3

lava · amadeus84 · Mar 10, 2022 · Mar 12, 2022 · Mar 12, 2022 · Mar 14, 2022
commit b203af70d796d00f3d5ed99f3f61281aad68c1cd
diff --git a/examples/animation.cpp b/examples/animation.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o animation $(python-config --includes) animation.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include <cmath>
 #include "../matplotlibcpp.h"
@@ -6,31 +10,34 @@ namespace plt = matplotlibcpp;
 
 int main()
 {
-	int n = 1000;
-	std::vector<double> x, y, z;
-
-	for(int i=0; i<n; i++) {
-		x.push_back(i*i);
-		y.push_back(sin(2*M_PI*i/360.0));
-		z.push_back(log(i));
-
-		if (i % 10 == 0) {
-			// Clear previous plot
-			plt::clf();
-			// Plot line from given x and y data. Color is selected automatically.
-			plt::plot(x, y);
-			// Plot a line whose name will show up as "log(x)" in the legend.
-			plt::named_plot("log(x)", x, z);
-
-			// Set x-axis to interval [0,1000000]
-			plt::xlim(0, n*n);
-
-			// Add graph title
-			plt::title("Sample figure");
-			// Enable legend.
-			plt::legend();
-			// Display plot continuously
-			plt::pause(0.01);
-		}
+    int n = 1000;
+    std::vector<double> x, y, z;
+
+    for(int i=0; i<n; i++) {
+	x.push_back(i*i);
+	y.push_back(sin(2*M_PI*i/360.0));
+	z.push_back(log(i));
+
+	if (i % 10 == 0) {
+	    // Clear previous plot
+	    plt::clf();
+	    // Plot line from given x and y data. Color is selected automatically.
+	    plt::plot(x, y);
+	    // Plot a line whose name will show up as "log(x)" in the legend.
+	    plt::named_plot("log(x)", x, z);
+
+	    // Set x-axis to interval [0,1000000]
+	    plt::xlim(0, n*n);
+
+	    // Add graph title
+	    plt::title("Sample figure");
+	    // Enable legend.
+	    plt::legend();
+	    // Display plot continuously
+	    plt::pause(0.01);
 	}
+    }
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/bar.cpp b/examples/bar.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o bar $(python-config --includes) bar.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 
 #include <iostream>
@@ -14,5 +18,6 @@ int main(int argc, char **argv) {
     plt::bar(test_data);
     plt::show();
 
+    plt::detail::_interpreter::kill();
     return (0);
 }
diff --git a/examples/basic.cpp b/examples/basic.cpp
@@ -1,11 +1,16 @@
+//
+// g++ -g -Wall -o basic -I/usr/include/python3.9 basic.cpp -lpython3.9
+// g++ -g -Wall -o basic $(python-config --includes) basic.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include <iostream>
 #include <cmath>
 #include "../matplotlibcpp.h"
 
 namespace plt = matplotlibcpp;
 
-int main() 
+int main()
 {
     // Prepare data.
     int n = 5000;
@@ -15,7 +20,7 @@ int main()
         y.at(i) = sin(2*M_PI*i/360.0);
         z.at(i) = log(i);
     }
-    
+
     // Set the size of output image = 1200x780 pixels
     plt::figure_size(1200, 780);
 
@@ -41,4 +46,7 @@ int main()
     const char* filename = "./basic.png";
     std::cout << "Saving result to " << filename << std::endl;;
     plt::save(filename);
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/basic.png b/examples/basic.png
diff --git a/examples/colorbar.cpp b/examples/colorbar.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o colorbar $(python-config --includes) colorbar.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include <cmath>
 #include <iostream>
@@ -29,4 +33,7 @@ int main()
     plt::show();
     plt::close();
     Py_DECREF(mat);
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/contour.cpp b/examples/contour.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o contour $(python-config --includes) contour.cpp $(python-config --ldflags --embed)
+//
+
 #include "../matplotlibcpp.h"
 
 #include <cmath>
@@ -21,4 +25,7 @@ int main()
 
     plt::contour(x, y, z);
     plt::show();
+
+    plt::detail::_interpreter::kill();
+    return (0);
 }
diff --git a/examples/fill.cpp b/examples/fill.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o fill $(python-config --includes) fill.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include "../matplotlibcpp.h"
 #include <cmath>
@@ -32,4 +36,7 @@ int main() {
         plt::fill(x1, y1, {});
     }
     plt::show();
+
+    plt::detail::_interpreter::kill();
+    return (0);
 }
diff --git a/examples/fill_inbetween.cpp b/examples/fill_inbetween.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o fill_inbetween $(python-config --includes) fill_inbetween.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include "../matplotlibcpp.h"
 #include <cmath>
@@ -7,22 +11,25 @@ using namespace std;
 namespace plt = matplotlibcpp;
 
 int main() {
-  // Prepare data.
-  int n = 5000;
-  std::vector<double> x(n), y(n), z(n), w(n, 2);
-  for (int i = 0; i < n; ++i) {
-    x.at(i) = i * i;
-    y.at(i) = sin(2 * M_PI * i / 360.0);
-    z.at(i) = log(i);
-  }
+    // Prepare data.
+    int n = 5000;
+    std::vector<double> x(n), y(n), z(n), w(n, 2);
+    for (int i = 0; i < n; ++i) {
+	x.at(i) = i * i;
+	y.at(i) = sin(2 * M_PI * i / 360.0);
+	z.at(i) = log(i);
+    }
+
+    // Prepare keywords to pass to PolyCollection. See
+    // https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.fill_between.html
+    std::map<string, string> keywords;
+    keywords["alpha"] = "0.4";
+    keywords["color"] = "grey";
+    keywords["hatch"] = "-";
 
-  // Prepare keywords to pass to PolyCollection. See
-  // https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.fill_between.html
-  std::map<string, string> keywords;
-  keywords["alpha"] = "0.4";
-  keywords["color"] = "grey";
-  keywords["hatch"] = "-";
+    plt::fill_between(x, y, z, keywords);
+    plt::show();
 
-  plt::fill_between(x, y, z, keywords);
-  plt::show();
+    plt::detail::_interpreter::kill();
+    return (0);
 }
diff --git a/examples/imshow.cpp b/examples/imshow.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o imshow $(python-config --includes) imshow.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include <cmath>
 #include <iostream>
@@ -26,4 +30,7 @@ int main()
     // Show plots
     plt::save("imshow.png");
     std::cout << "Result saved to 'imshow.png'.\n";
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/lines3d.cpp b/examples/lines3d.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o lines3d $(python-config --includes) lines3d.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include "../matplotlibcpp.h"
 #include <cmath>
@@ -9,7 +13,7 @@ int main()
     std::vector<double> x, y, z;
     double theta, r;
     double z_inc = 4.0/99.0; double theta_inc = (8.0 * M_PI)/99.0;
-    
+
     for (double i = 0; i < 100; i += 1) {
         theta = -4.0 * M_PI + theta_inc*i;
         z.push_back(-2.0 + z_inc*i);
@@ -27,4 +31,7 @@ int main()
     plt::set_zlabel("z label"); // set_zlabel rather than just zlabel, in accordance with the Axes3D method
     plt::legend();
     plt::show();
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/minimal.cpp b/examples/minimal.cpp
@@ -1,8 +1,14 @@
+//
+// g++ -g -Wall -o minimal $(python-config --includes) minimal.cpp $(python-config --ldflags --embed)
+//
 #include "../matplotlibcpp.h"
 
 namespace plt = matplotlibcpp;
 
 int main() {
     plt::plot({1,3,2,4});
     plt::show();
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/modern.cpp b/examples/modern.cpp
@@ -1,33 +1,40 @@
+//
+// g++ -g -Wall -o modern $(python-config --includes) modern.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include <cmath>
 #include "../matplotlibcpp.h"
 
 using namespace std;
 namespace plt = matplotlibcpp;
 
-int main() 
+int main()
 {
-	// plot(y) - the x-coordinates are implicitly set to [0,1,...,n)
-	//plt::plot({1,2,3,4}); 
-
-	// Prepare data for parametric plot.
-	int n = 5000; // number of data points
-	vector<double> x(n),y(n); 
-	for(int i=0; i<n; ++i) {
-		double t = 2*M_PI*i/n;
-		x.at(i) = 16*sin(t)*sin(t)*sin(t);
-		y.at(i) = 13*cos(t) - 5*cos(2*t) - 2*cos(3*t) - cos(4*t);
-	}
-
-	// plot() takes an arbitrary number of (x,y,format)-triples. 
-	// x must be iterable (that is, anything providing begin(x) and end(x)),
-	// y must either be callable (providing operator() const) or iterable. 
-	plt::plot(x, y, "r-", x, [](double d) { return 12.5+abs(sin(d)); }, "k-");
-
-	//plt::set_aspect(0.5);
-	plt::set_aspect_equal();
-
-
-	// show plots
-	plt::show();
+    // plot(y) - the x-coordinates are implicitly set to [0,1,...,n)
+    //plt::plot({1,2,3,4});
+
+    // Prepare data for parametric plot.
+    int n = 5000; // number of data points
+    vector<double> x(n),y(n);
+    for(int i=0; i<n; ++i) {
+	double t = 2*M_PI*i/n;
+	x.at(i) = 16*sin(t)*sin(t)*sin(t);
+	y.at(i) = 13*cos(t) - 5*cos(2*t) - 2*cos(3*t) - cos(4*t);
+    }
+
+    // plot() takes an arbitrary number of (x,y,format)-triples.
+    // x must be iterable (that is, anything providing begin(x) and end(x)),
+    // y must either be callable (providing operator() const) or iterable.
+    plt::plot(x, y, "r-", x, [](double d) { return 12.5+abs(sin(d)); }, "k-");
+
+    //plt::set_aspect(0.5);
+    plt::set_aspect_equal();
+
+
+    // show plots
+    plt::show();
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/nonblock.cpp b/examples/nonblock.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o nonblock $(python-config --includes) nonblock.cpp $(python-config --ldflags --embed)
+//
+
 #define _USE_MATH_DEFINES
 #include <cmath>
 #include "../matplotlibcpp.h"
@@ -43,4 +47,7 @@ int main()
 
     cout << "matplotlibcpp::show() is working in an non-blocking mode" << endl;<
1241
/span>
     getchar();
+
+    plt::detail::_interpreter::kill();
+    return 0;
 }
diff --git a/examples/quiver.cpp b/examples/quiver.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o quiver $(python-config --includes) quiver.cpp $(python-config --ldflags --embed)
+//
+
 #include "../matplotlibcpp.h"
 
 namespace plt = matplotlibcpp;
@@ -17,4 +21,7 @@ int main()
 
     plt::quiver(x, y, u, v);
     plt::show();
-}
+
+    plt::detail::_interpreter::kill();
+    return 0;
+}
diff --git a/examples/spy.cpp b/examples/spy.cpp
@@ -1,3 +1,7 @@
+//
+// g++ -g -Wall -o spy $(python-config --includes) spy.cpp $(python-config --ldflags --embed)
+//
+
 #include "../matplotlibcpp.h"
 
 #include <iostream>
@@ -26,5 +30,6 @@ int main()
     plt::spy(matrix, 5, {{"marker", "o"}});
     plt::show();
 
+    plt::detail::_interpreter::kill();
     return 0;
 }