chore: extract io function to file

CMakeLists.txt

@@ -24,7 +24,7 @@ elseif(APPLE)
     message(FATAL_ERROR "macOS is not supported yet.")
 endif()
 
-add_executable(${PROJECT_NAME} hello.cpp)
+add_executable(${PROJECT_NAME} hello.cpp io.cpp)
 
 if(WIN32)
     add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD

hello.cpp

@@ -40,29 +40,11 @@
 #include <GLFW/glfw3.h>
 
 #include <iostream>
-#include <fstream>
-#include <sstream>
 #include <string>
 
 #include <chrono>
 
-std::string readFile(const std::string& filePath)
-{
-    std::ifstream fileStream(filePath, std::ios::in);
-
-    if (!fileStream.is_open())
-    {
-        std::cerr << "Could not read file " << filePath <<
-            ". File does not exist." << std::endl;
-        return "";
-    }
-
-    std::stringstream sstr;
-    sstr << fileStream.rdbuf();
-    fileStream.close();
-
-    return sstr.str();
-}
+#include "io.hpp"
 
 GLuint compileShader(const std::string& shaderPath, GLenum shaderType)
 {

io.cpp

@@ -0,0 +1,23 @@
+#include "io.hpp"
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+
+std::string readFile(const std::string& filePath)
+{
+    std::ifstream fileStream(filePath, std::ios::in);
+
+    if (!fileStream.is_open())
+    {
+        std::cerr << "Could not read file " << filePath <<
+            ". File does not exist." << std::endl;
+        return "";
+    }
+
+    std::stringstream sstr;
+    sstr << fileStream.rdbuf();
+    fileStream.close();
+
+    return sstr.str();
+}

io.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <string>
+
+std::string readFile(const std::string& filePath);