What is the C equivalent of friend

Question

Possible Duplicate    Why does C  not provide the C   style    friend    keyword        I d like the private member variables of a class to be accessible to a Tester class without exposing them to other classes    In C   I d just declare the Tester class as a friend  how do I do this in C   Can someone give me an example

User · Answer

The closet equivalent is to create a nested class which will be able to access the outer class' private members. Something like this:

class Outer
{
    class Inner
    {
       // This class can access Outer's private members
    }
}

or if you prefer to put the Inner class in another file:

Outer.cs
partial class Outer
{
}


Inner.cs
partial class Outer
{
    class Inner
    {
       // This class can access Outer's private members
    }
}

User · Answer

The closet equivalent is to create a nested class which will be able to access the outer class' private members. Something like this:

class Outer
{
    class Inner
    {
       // This class can access Outer's private members
    }
}

or if you prefer to put the Inner class in another file:

Outer.cs
partial class Outer
{
}


Inner.cs
partial class Outer
{
    class Inner
    {
       // This class can access Outer's private members
    }
}

User · Answer

Take a very common pattern  Class Factory makes Widgets  The Factory class needs to muck about with the internals  because  it is the Factory  Both are implemented in the same file and are  by design and desire and nature  tightly coupled classes -- in fact  Widget is really just an output type from factory   In C    make the Factory a friend of Widget class   In C   what can we do  The only decent solution that has occurred to me is to invent an interface  IWidget  which only exposes the public methods  and have the Factory return IWidget interfaces   This involves a fair amount of tedium - exposing all the naturally public properties again in the interface

User · Answer

Take a very common pattern  Class Factory makes Widgets  The Factory class needs to muck about with the internals  because  it is the Factory  Both are implemented in the same file and are  by design and desire and nature  tightly coupled classes -- in fact  Widget is really just an output type from factory   In C    make the Factory a friend of Widget class   In C   what can we do  The only decent solution that has occurred to me is to invent an interface  IWidget  which only exposes the public methods  and have the Factory return IWidget interfaces   This involves a fair amount of tedium - exposing all the naturally public properties again in the interface

User · Answer

There isn t a  friend  keyword in C  but one option for testing private methods is to use System Reflection to get a handle to the method  This will allow you to invoke private methods   Given a class with this definition   public class Class1       private int CallMe                 return 1            You can invoke it using this code   Class1 c   new Class1    Type class1Type   c GetType    MethodInfo callMeMethod   class1Type GetMethod  CallMe   BindingFlags Instance   BindingFlags NonPublic    int result    int callMeMethod Invoke c  null    Console WriteLine result     If you are using Visual Studio Team System then you can get VS to automatically generate a proxy class with private accessors in it by right clicking the method and selecting  Create Unit Tests

User · Answer

You can simulate a friend access if the class that is given the right to access is inside another package and if the methods you are exposing are marked as internal or internal protected  You have to modify the assembly you want to share and add the following settings to AssemblyInfo cs       Expose the internal members to the types in the My Tester assembly  assembly  InternalsVisibleTo  My Tester  PublicKey      012700000480000094000000060200000024000052534131000400000100010091ab9     ba23e07d4fb7404041ec4d81193cfa9d661e0e24bd2c03182e0e7fc75b265a092a3f8     52c672895e55b95611684ea090e787497b0d11b902b1eccd9bc9ea3c9a56740ecda8e     961c93c3960136eefcdf106955a4eb8fff2a97f66049cd0228854b24709c0c945b499     413d29a2801a39d4c4c30bab653ebc8bf604f5840c88      The public key is optional  depending on your needs

User · Answer

There isn t a  friend  keyword in C  but one option for testing private methods is to use System Reflection to get a handle to the method  This will allow you to invoke private methods   Given a class with this definition   public class Class1       private int CallMe                 return 1            You can invoke it using this code   Class1 c   new Class1    Type class1Type   c GetType    MethodInfo callMeMethod   class1Type GetMethod  CallMe   BindingFlags Instance   BindingFlags NonPublic    int result    int callMeMethod Invoke c  null    Console WriteLine result     If you are using Visual Studio Team System then you can get VS to automatically generate a proxy class with private accessors in it by right clicking the method and selecting  Create Unit Tests

User · Answer

There s no direct equivalent of  friend  - the closest that s available  and it isn t very close  is InternalsVisibleTo  I ve only ever used this attribute for testing - where it s very handy   Example  To be placed in AssemblyInfo cs   assembly  InternalsVisibleTo  OtherAssembly

User · Answer

There isn t a  friend  keyword in C  but one option for testing private methods is to use System Reflection to get a handle to the method  This will allow you to invoke private methods   Given a class with this definition   public class Class1       private int CallMe                 return 1            You can invoke it using this code   Class1 c   new Class1    Type class1Type   c GetType    MethodInfo callMeMethod   class1Type GetMethod  CallMe   BindingFlags Instance   BindingFlags NonPublic    int result    int callMeMethod Invoke c  null    Console WriteLine result     If you are using Visual Studio Team System then you can get VS to automatically generate a proxy class with private accessors in it by right clicking the method and selecting  Create Unit Tests

User · Answer

There isn t a  friend  keyword in C  but one option for testing private methods is to use System Reflection to get a handle to the method  This will allow you to invoke private methods   Given a class with this definition   public class Class1       private int CallMe                 return 1            You can invoke it using this code   Class1 c   new Class1    Type class1Type   c GetType    MethodInfo callMeMethod   class1Type GetMethod  CallMe   BindingFlags Instance   BindingFlags NonPublic    int result    int callMeMethod Invoke c  null    Console WriteLine result     If you are using Visual Studio Team System then you can get VS to automatically generate a proxy class with private accessors in it by right clicking the method and selecting  Create Unit Tests

User · Answer

There s no direct equivalent of  friend  - the closest that s available  and it isn t very close  is InternalsVisibleTo  I ve only ever used this attribute for testing - where it s very handy   Example  To be placed in AssemblyInfo cs   assembly  InternalsVisibleTo  OtherAssembly

User · Answer

There s no direct equivalent of  friend  - the closest that s available  and it isn t very close  is InternalsVisibleTo  I ve only ever used this attribute for testing - where it s very handy   Example  To be placed in AssemblyInfo cs   assembly  InternalsVisibleTo  OtherAssembly

User · Answer

There s no direct equivalent of  friend  - the closest that s available  and it isn t very close  is InternalsVisibleTo  I ve only ever used this attribute for testing - where it s very handy   Example  To be placed in AssemblyInfo cs   assembly  InternalsVisibleTo  OtherAssembly

User · Answer

You can simulate a friend access if the class that is given the right to access is inside another package and if the methods you are exposing are marked as internal or internal protected  You have to modify the assembly you want to share and add the following settings to AssemblyInfo cs       Expose the internal members to the types in the My Tester assembly  assembly  InternalsVisibleTo  My Tester  PublicKey      012700000480000094000000060200000024000052534131000400000100010091ab9     ba23e07d4fb7404041ec4d81193cfa9d661e0e24bd2c03182e0e7fc75b265a092a3f8     52c672895e55b95611684ea090e787497b0d11b902b1eccd9bc9ea3c9a56740ecda8e     961c93c3960136eefcdf106955a4eb8fff2a97f66049cd0228854b24709c0c945b499     413d29a2801a39d4c4c30bab653ebc8bf604f5840c88      The public key is optional  depending on your needs

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