B4R Question [SOLVED] A real dummy question when using inline C

Johan Schoeman · Sep 11, 2019

I am stuck here....I am trying to call "multiply" from "add" and passing a value of 5 to "multiply" from "add". But I get this error:

B4X:

b4r_main.cpp:13: error: 'multiply' was not declared in this scope

Please help this dummy (me) to understand what it is that I am missing....

B4X:

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 300
#End Region

Sub Process_Globals
    Public Serial1 As Serial
    Private Result, N1, N2 As Int 'ignore
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    N1 = 10
    N2 = 20
    RunNative("add", Null)
    Log("Result: ", Result)
End Sub

#if C
void add (B4R::Object* o) {
   //lower case variables
   b4r_main::_result = b4r_main::_n1 + b4r_main::_n2;
   multiply(5);                //THE ERROR IS HERE! b4r_main.cpp:13: error: 'multiply' was not declared in this scope
}

void multiply (int d) {
   //lower case variables
   b4r_main::_result = b4r_main::_n1 * d;
}


#End if

Johan Schoeman · Sep 11, 2019

This seems to work:

B4X:

#if C


void multiply(int d);

void add (B4R::Object* o) {
   //lower case variables
   b4r_main::_result = b4r_main::_n1 + b4r_main::_n2;
   multiply(5);                //THE ERROR IS HERE! b4r_main.cpp:13: error: 'multiply' was not declared in this scope
}

void multiply (int d) {
   //lower case variables
   b4r_main::_result = b4r_main::_n1 * d;
}


#End if

Is this the correct way of doing it?

thetahsk · Sep 11, 2019

Johan Schoeman said:

This seems to work:

B4X:

#if C


void multiply(int d);

void add (B4R::Object* o) {
   //lower case variables
   b4r_main::_result = b4r_main::_n1 + b4r_main::_n2;
   multiply(5);                //THE ERROR IS HERE! b4r_main.cpp:13: error: 'multiply' was not declared in this scope
}

void multiply (int d) {
   //lower case variables
   b4r_main::_result = b4r_main::_n1 * d;
}


#End if

Is this the correct way of doing it?

you got it, it's called forward declaration.

https://en.wikipedia.org/wiki/Forward_declaration

Johan Schoeman · Sep 11, 2019

thetahsk said:
you got it, it's called forward declaration.

https://en.wikipedia.org/wiki/Forward_declaration

It is working in my project.

Laurent95 · Sep 30, 2019

Johan Schoeman said:
It is working in my project.

Hello,
Another way is to put the sub 'Multiply' before the 'Add'.
Doing the compiler to stop to scream too

thetahsk · Sep 30, 2019

Laurent95 said:
Hello,
Another way is to put the sub 'Multiply' before the 'Add'.
Doing the compiler to stop to scream too

...and your anti scream recipe for this sceneario...

B4X:

#if C
    
void foo_1 (void)  {  foo_2(); }
void foo_2 (void)  {  foo_1(); }

#End if

Laurent95 · Sep 30, 2019

thetahsk said:
...and your anti scream recipe for this sceneario...

B4X:

#if C void foo_1 (void) { foo_2(); } void foo_2 (void) { foo_1(); } #End if

I do a nap and let the compiler screaming
Because with recursive calls, i'm not sure that even the "forward declaration" change something.

Tell me, your dog run after his tail ?

B4R Question [SOLVED] A real dummy question when using inline C

Johan Schoeman

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Johan Schoeman

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thetahsk

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Johan Schoeman

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Laurent95

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