search

martinmoene / optional-lite

optional lite - A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library
Boost Software License 1.0
403 stars 45 forks source link

Consider adding value_or_eval() #67

Closed martinmoene closed 2 years ago

martinmoene commented 2 years ago

See issue 54 at TartanLlama/optional.

Boost.Optional:

    template <typename F>
    value_type value_or_eval ( F f ) const&
      {
        if (this->is_initialized())
          return get();
        else
          return f();
      }

    template <typename F>
    value_type value_or_eval ( F f ) &&
      {
        if (this->is_initialized())
          return boost::move(get());
        else
          return f();
      }