Redefinition of default parameter : parameter 4

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When compile I get the error redefinition of default parameter : parameter 4

What I have tried:

I have compiled , but did not work

Posted 19-Jan-18 11:44am

Member 13633258

Updated 19-Jan-18 23:45pm

KarstenK

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Patrice T 19-Jan-18 17:53pm

And you have some source code?

jeron1 19-Jan-18 17:57pm

You're going to have to show some relevant code.

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KarstenK · Answer 1 · 2018-01-19T23:08:00

You must carefully read the codeline where the error is happening. I guess that you have an default parameter not only in the header declaration but also in the code implementation.

A default parameter is only used in the declaration. If it doesnt solve the problem provide all related code and the full error message text.

CPallini · Answer 2 · 2018-01-19T23:45:00

[updated, thanks to Richard]
C++ default arguments[^] must be specified either in function (or method) declarations or in function (or method) definitions.
Specifying it in both declaration and definition is an error.
The preferred approach is specifying it only in function (or method) declarations.

For example

C++

// function declarations
int my_add( int a, int b =  5);
int my_sub( int a, int b = -1);
// ..
// function definitions
int my_add( int a, int b = 5) //<- WRONG, default parameter repeated in function definition
{
  return (a + b);
}
int my_sub( int a, int b) //<- fine
{
  return (a -b);
}

[/update]

Redefinition of default parameter : parameter 4

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