optional.md

Optional

• Headers : Win32Ex/Optional.hpp

Contents

• Optional
  • Contents
  • Reference
    • Classes
      • Optional<T>
      • Optional<T &>
      • Optional<String>
      • Optional<StringW>
      • Optional<const String>
      • Optional<const StringW>
      • Optional<String &>
      • Optional<StringW &>
      • Optional<const String &>
      • Optional<const StringW &>
      • Optional<const StringT &>
    • Example

Reference

Classes

Optional<T>

Optional<T &>

Optional<String>

Optional<StringW>

Optional<const String>

Optional<const StringW>

Optional<String &>

Optional<StringW &>

Optional<const String &>

Optional<const StringW &>

Optional<const StringT &>

Example

#include <Win32Ex/Optional.hpp>

using namespace Win32Ex;

void TestFn(Optional<int> arg0 = None(), Optional<double> arg1 = None(), Optional<String> arg2 = None())
{
  if (arg0.IsSome())
  {
    int val = arg0;
  }

  if (arg1.IsSome())
  {
    double val = arg1;
  }

  if (arg2.IsSome())
  {
    String val = arg2;
  }

  if (IsAll(arg0, arg1, arg2))
  {
    int val0 = arg0;
    double val1 = arg1;
    String val2 = arg2;
    ...
  }

  if (IsNone(arg0, arg1, arg2))
  {
    ...
  }
}

TestFn();
TestFn(1);
TestFn(None(), 2, None());
TestFn(None(), None(), "3");
TestFn(None(), 2, "3");
TestFn(1, None(), "3");
TestFn(1, 2);
TestFn(1, 2, "3");