5 things to not bother in C++

experimental/CMakeLists.txt

@@ -2,5 +2,7 @@ set(CMAKE_CXX_STANDARD 20)
 
 # https://www.mssl.ucl.ac.uk/swift/om/sw/help/man/bfd_toc.html
 
-add_executable(bfd-example bfd-example.cpp)
-target_link_libraries(bfd-example bfd)
+if(UNIX AND NOT APPLE)
+  add_executable(bfd-example bfd-example.cpp)
+  target_link_libraries(bfd-example bfd)
+endif()

src/SUMMARY.md

@@ -68,4 +68,5 @@
 
 # Experimental
 
-- [BFD]()
+- [BFD]()
+- [5 things to not bother in C++](./advanced/useless.md)

src/advanced/useless.md

@@ -0,0 +1,31 @@
+# 5 things to not bother in C++
+
+## Pseudo destructors
+
+```cpp
+typedef int I;
+int main() {
+  I x = 10;
+  x.I::~I();
+  x = 20;
+}
+```
+
+  [Built-in member access operators(https://en.cppreference.com/w/cpp/language/operator_member_access#Built-in_member_access_operators)
+
+## ODR use
+
+ODR use _something_ [so question](https://stackoverflow.com/questions/19630570/what-does-it-mean-to-odr-use-something)
+
+```cpp
+struct F {
+   static const int g_x = 2;
+};
+
+int g_x_plus_1 = F::g_x + 1; // in this context, only the value of g_x is needed.
+                             // so it's OK without the definition of g_x
+
+vector<int>  vi;
+vi.push_back( F::g_x );      // Error, this is odr-used, push_back(const int & t) expect
+                             // a const lvalue, so it's definition must be present
+```

time/CMakeLists.txt

@@ -1,2 +1,6 @@
-add_executable(2070_rtc 2070-rtc-limit.c)
+
+if(UNIX AND NOT APPLE)
+  add_executable(2070_rtc 2070-rtc-limit.c)
+endif()
+
 add_executable(scheduler scheduler.cpp)