Compiler Warning (level 1) C4395
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Compiler Warning (level 1) C4395

Error Message

'function' : member function will be invoked on a copy of the initonly data member 'member'

A member function was called on an initonly data member. C4395 warns that the initonly data member cannot be modified by the function.

The following sample generates C4395:

// C4395.cpp
// compile with: /W1 /clr
public value class V {
   V(int data) : m_data(data) {}

   void Mutate() {
      System::Console::WriteLine("Enter Mutate: m_data = {0}", m_data);
      m_data *= 2;
      System::Console::WriteLine("Leave Mutate: m_data = {0}", m_data);

   int m_data;

public ref class R {
   static void f() {
      System::Console::WriteLine("v.m_data = {0}", v.m_data);
      v.Mutate();   // C4395
      System::Console::WriteLine("v.m_data = {0}", v.m_data);

   initonly static V v = V(4);

int main() {
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