C++ Catch up

namespace

• shouldn't use using namespace
• if we use using namespace and have methods with the same name in different namespaces, it can cause ambiguity and result in a compilation error.

#include <iostream>

namespace A {
    void print() {  ...  }
}

namespace B {
    void print() {  ...  }
}

int main() {
    // wrong
    using namespace A;
    using namespace B;
    print() 

    // correct
    A::print(); 
    B::print();

    return 0;
}

Basic Type

• In C++, basically explicit type declaration is recommended
  • 👍 Clearly fixed sizes and simple type names
  • 📑 int a -> std::int8_t a
• double (32 bit) vs float (64 bit)
  • Accuracy: double > float
  • Speed: double < float
• enum vs enum class
  • 👍 enum class is typically the safer and cleaner choice.
    • Scope: prevent name conflicts with other enumerators or variables.
    • Type safety: prevent implicit conversions to and from integers.
    • Explicit type: Requires explicit casting for conversions

Variable

• const vs constexpr
  • xxx

function

• If we use override, we must use the override modifier.
  • 👍 improve readability
  • 👍 improve safity by catching potential errors at compile time.
  main.cpp

  ...example
  

Pointer