see changkun#2: code updates

Author: changkun

code/1/1.1.c.and.cpp

@@ -5,6 +5,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include "foo.h"

code/1/Makefile

@@ -5,6 +5,7 @@
 # modern cpp tutorial
 #
 # created by changkun at changkun.de
+# https://github.com/changkun/modern-cpp-tutorial
 #
 
 C = gcc

code/1/foo.c

@@ -5,6 +5,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include "foo.h"

code/1/foo.h

@@ -5,6 +5,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #ifdef __cplusplus

code/10/Makefile

@@ -1,7 +1,14 @@
+#
+# modern cpp tutorial
+#
+# created by changkun at changkun.de
+# https://github.com/changkun/modern-cpp-tutorial
+#
+
 all: $(patsubst %.cpp, %.out, $(wildcard *.cpp))
 
 %.out: %.cpp Makefile
-	clang++ $< -o $@ -std=c++2a -Xclang -fconcepts-ts -pedantic
+	clang++ $< -o $@ -std=c++2a -pedantic
 
 clean:
 	rm *.out

code/2/2.01.nullptr.cpp

@@ -4,6 +4,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include <iostream>

code/2/2.02.constexpr.cpp

@@ -4,6 +4,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include <iostream>

code/2/2.03.if.switch.cpp

@@ -4,6 +4,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include <iostream>
@@ -13,13 +14,12 @@
 int main() {
     std::vector<int> vec = {1, 2, 3, 4};
 
-    // before c++17, can be simplefied by using `auto`
+    // after c++17, can be simplefied by using `auto`
     const std::vector<int>::iterator itr = std::find(vec.begin(), vec.end(), 2);
     if (itr != vec.end()) {
         *itr = 3;
     }
 
-    // after c++17, can be simplefied by using `auto`
     if (const std::vector<int>::iterator itr = std::find(vec.begin(), vec.end(), 3);
         itr != vec.end()) {
         *itr = 4;

code/2/2.04.initializer.list.cpp

@@ -4,6 +4,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include <iostream>

code/2/2.05.structured.binding.cpp

@@ -4,6 +4,7 @@
 // modern cpp tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 
 #include <iostream>