Add miscelaneous directory. Add ifstream-issue...

... there.  The parent class should be used to overload the << (or >>)
operators for ostream (or istream ).  Using ifstream is bad and leads to
issues as shown in the example code.

1 files changed, 47 insertions, 0 deletions

diff --git a/misc/ofstream-issue/ofstream-issue.cpp b/misc/ofstream-issue/ofstream-issue.cpp
new file mode 100644
index 0000000..094e0dd
--- /dev/null
+++ b/misc/ofstream-issue/ofstream-issue.cpp
@@ -0,0 +1,47 @@
+#include <iostream>
+#include <fstream>
+#include <typeinfo>
+
+#define MAXLEN 100
+
+using namespace std;
+
+/* Usando ostream (stream) */
+typedef struct {
+    int id;
+    const char name[MAXLEN];
+} student1_t;
+
+ostream& operator<<(ostream& os, student1_t rhs) {
+    os << "Student name: " << rhs.name;
+    return os;
+}
+
+/* Usando oftream (file) */
+typedef struct {
+    int id;
+    const char name[MAXLEN];
+} student2_t;
+
+ofstream& operator<<(ofstream& os, student2_t rhs) {
+    os << "Student name: " << rhs.name;
+    return os;
+}
+
+int main() {
+    ofstream out("report.txt");
+    if (!out) {
+        cerr << "Error: no se pudo abrir el archivo\n";
+        return 1;
+    }
+    student1_t student1 = {1, "Ana Ambooken"};
+    student2_t student2 = {2, "Bob Banana"};
+
+    out << student1 << "PUCP" << '\n';  // works
+    out << "PUCP" << student1 << '\n';  // works
+
+    out << student2 << "PUCP" << '\n';  // works
+    /* out << "PUCP" << student2 << '\n';  // breaks */
+
+    return 0;
+}