From b8338b0528db21ddcb669c80fdcf8672094843ce Mon Sep 17 00:00:00 2001
From: Sebastien Ponce <Sebastien.Ponce@cern.ch>
Date: Wed, 12 Mar 2025 15:48:27 +0100
Subject: [PATCH] Added explanation for usage of CHECK macro in exercises

---
 exercises/classes/classes.cpp                  | 4 ++++
 exercises/classes/solution/classes_sol.cpp     | 4 ++++
 exercises/operators/operators.cpp              | 4 ++++
 exercises/operators/solution/operators_sol.cpp | 4 ++++
 4 files changed, 16 insertions(+)

diff --git a/exercises/classes/classes.cpp b/exercises/classes/classes.cpp
index e3cba9fe..05bd5dc4 100644
--- a/exercises/classes/classes.cpp
+++ b/exercises/classes/classes.cpp
@@ -35,6 +35,10 @@ class Fraction {
 
 // ADD YOUR CODE HERE
 
+// This is using the cpp, the C preprocessor to expand a bit of code
+// (the what argument) to a pair containing a string representation
+// of it and the code itself. That way, print is given a string and a
+// value where the string is the code that lead to the value
 #define CHECK(print,what) print(#what, what)
 
 unsigned int WIDTH {20};
diff --git a/exercises/classes/solution/classes_sol.cpp b/exercises/classes/solution/classes_sol.cpp
index f85f5c9b..7b0f38b5 100644
--- a/exercises/classes/solution/classes_sol.cpp
+++ b/exercises/classes/solution/classes_sol.cpp
@@ -53,6 +53,10 @@ class TestResultPrinter {
 
 };
 
+// This is using the cpp, the C preprocessor to expand a bit of code
+// (the what argument) to a pair containing a string representation
+// of it and the code itself. That way, print is given a string and a
+// value where the string is the code that lead to the value
 #define CHECK(printer,what) printer.process(#what, what)
 
 int main() {
diff --git a/exercises/operators/operators.cpp b/exercises/operators/operators.cpp
index caa361c2..625c9c25 100644
--- a/exercises/operators/operators.cpp
+++ b/exercises/operators/operators.cpp
@@ -58,6 +58,10 @@ class TestResultPrinter {
 
 };
 
+// This is using the cpp, the C preprocessor to expand a bit of code
+// (the what argument) to a pair containing a string representation
+// of it and the code itself. That way, print is given a string and a
+// value where the string is the code that lead to the value
 #define CHECK(printer,what) printer.process(#what, what)
 
 int main() {
diff --git a/exercises/operators/solution/operators_sol.cpp b/exercises/operators/solution/operators_sol.cpp
index a03fda7e..2ec53056 100644
--- a/exercises/operators/solution/operators_sol.cpp
+++ b/exercises/operators/solution/operators_sol.cpp
@@ -69,6 +69,10 @@ class TestResultPrinter {
 
 };
 
+// This is using the cpp, the C preprocessor to expand a bit of code
+// (the what argument) to a pair containing a string representation
+// of it and the code itself. That way, print is given a string and a
+// value where the string is the code that lead to the value
 #define CHECK(printer,what) printer(#what, what)
 
 int main() {