CC-1237: Use autoflush using std::unitbuf for c++ repos

compiled_starters/cpp/src/Server.cpp

@@ -11,6 +11,10 @@ bool match_pattern(const std::string& input_line, const std::string& pattern) {
 }
 
 int main(int argc, char* argv[]) {
+    // Flush after every std::cout / std::cerr
+    std::cout << std::unitbuf;
+    std::cerr << std::unitbuf;
+
     // You can use print statements as follows for debugging, they'll be visible when running tests.
     std::cout << "Logs from your program will appear here" << std::endl;
 

solutions/cpp/01-cq2/code/src/Server.cpp

@@ -11,6 +11,10 @@ bool match_pattern(const std::string& input_line, const std::string& pattern) {
 }
 
 int main(int argc, char* argv[]) {
+    // Flush after every std::cout / std::cerr
+    std::cout << std::unitbuf;
+    std::cerr << std::unitbuf;
+
     if (argc != 3) {
         std::cerr << "Expected two arguments" << std::endl;
         return 1;

solutions/cpp/01-cq2/diff/src/Server.cpp.diff

@@ -1,4 +1,4 @@
-@@ -1,45 +1,40 @@
+@@ -1,49 +1,44 @@
  #include <iostream>
  #include <string>
 
@@ -12,6 +12,10 @@
  }
 
  int main(int argc, char* argv[]) {
+     // Flush after every std::cout / std::cerr
+     std::cout << std::unitbuf;
+     std::cerr << std::unitbuf;
+
 -    // You can use print statements as follows for debugging, they'll be visible when running tests.
 -    std::cout << "Logs from your program will appear here" << std::endl;
 -

starter_templates/cpp/src/Server.cpp

@@ -11,6 +11,10 @@ bool match_pattern(const std::string& input_line, const std::string& pattern) {
 }
 
 int main(int argc, char* argv[]) {
+    // Flush after every std::cout / std::cerr
+    std::cout << std::unitbuf;
+    std::cerr << std::unitbuf;
+
     // You can use print statements as follows for debugging, they'll be visible when running tests.
     std::cout << "Logs from your program will appear here" << std::endl;