explicit

I am doing some geocoding work that I used selenium to screen scrape the x-y coordinate I need for address of a location, I imported an xls file to panda dataframe and want to use explicit loop to update the rows which do not have the x-y coordinate, like below: for index, row in rche_df.iterrows(): if isinstance(row.wgs1984_latitude, float): row = row.copy() target = row.address_chi dict_temp = geocoding(target) row.wgs1984_latitude = dict_temp['lat'] row.wgs1984_longitude = dict_temp['long'] I have read Why doesn't this function "take" after I iterrows over a pandas DataFrame? and am fully

// The Structure of the Container and the items public interface IContainer <TItem> where TItem : IItem { } public class AContainer : IContainer<ItemA> { } public interface IItem { } public class ItemA : IItem { } // Client app [Test] public void Test () { IContainer<IItem> container = new AContainer(); } Question : In test the following error occures. What can be the solution for casting? Cannot implicitly convert type 'AContainer' to 'IContainer'. An explicit conversion exists (are you missing a cast?) Another generics covariant problem... Generic types in .NET are not covariant or

This question already has an answer here: Why isn't it possible to define implicit cast operator from interface to class? 2 answers I'm just wondering if anyone knows the reason why you are not allowed to use interfaces with the implicit or explicit operators? E.g. this raises compile time error: public static explicit operator MyPlayer(IPlayer player) { ... } "user-defined conversions to or from an interface are not allowed" Thanks, Section 10.9.3 of the C# spec spells this out. The short version is that it's disallowed so that the user can be certain that conversions between reference types

Having recently introduced an overload of a method the application started to fail. Finally tracking it down, the new method is being called where I did not expect it to be. We had setValue( const std::wstring& name, const std::wstring& value ); std::wstring avalue( func() ); setValue( L"string", avalue ); std::wstring bvalue( func2() ? L"true", L"false" ); setValue( L"bool", bvalue ); setValue( L"empty", L"" ); It was changed so that when a bool value is stored we use the same strings (internal data storage of strings) setValue( const std::wstring& name, const std::wstring& value ); setValue(

I have extended std::string to fulfil my needs of having to write custom function build into string class called CustomString I have defined constructors: class CustomString : public std::string { public: explicit CustomString(void); explicit CustomString(const std::string& str); explicit CustomString(const CustomString& customString); //assignment operator CustomString& operator=(const CustomString& customString); ... }; In the third constructor (copy constructor) and assignment operator, whose definition is: CustomString::CustomString(const CustomString& customString): std::string(static

When it comes to constructors, adding the keyword explicit prevents an enthusiastic compiler from creating an object when it was not the programmer’s first intention. Is such mechanism available for casting operators too? struct Foo { operator std::string() const; }; Here, for instance, I would like to be able to cast Foo into a std::string , but I don’t want such cast to happen implicitly. Nawaz Yes and No. It depends on which version of C++, you're using. C++98 and C++03 do not support explicit type conversion operators But C++11 does. Example, struct A { //implicit conversion to int