New directory for GiNaC examples.

[ginac.git] / doc / examples / archive1.cpp

diff --git a/doc/examples/archive1.cpp b/doc/examples/archive1.cpp
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+/*
+ *  Archiving code example from the tutorial
+ */
+
+#include <fstream>
+using namespace std;
+#include <ginac/ginac.h>
+using namespace GiNaC;
+
+int main()
+{
+       symbol x("x"), y("y"), z("z");
+
+       // do some math
+       
+       ex foo = sin(x + 2*y) + 3*z + 41;
+       ex bar = foo + 1;
+
+       // write the archive
+       
+       archive a;
+       a.archive_ex(foo, "foo");
+       a.archive_ex(bar, "the second one");
+
+       ofstream out("foobar.gar");
+       out << a;
+       out.close();
+
+       // read in the archive
+       
+       archive a2;
+       ifstream in("foobar.gar");
+       in >> a2;
+
+       lst syms;
+       syms = x, y;
+
+       ex ex1 = a2.unarchive_ex(syms, "foo");
+       ex ex2 = a2.unarchive_ex(syms, "the second one");
+
+       // do some math again
+       
+       cout << ex1 << endl;              // prints "41+sin(x+2*y)+3*z"
+       cout << ex2 << endl;              // prints "42+sin(x+2*y)+3*z"
+       cout << ex1.subs(x == 2) << endl; // prints "41+sin(2+2*y)+3*z"
+}
+