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C++ Macros with multiple statements


C++ Macros with multiple statements

By : mr duc
Date : November 18 2020, 03:49 PM
Does that help I am analyzing the source of the FileTransfer open source project from sourceforge. I'm new to C++ and I came across the following macro: , It just replaces he occurrence of
code :
USES_CONVERSION
int _convert; (_convert); UINT _acp = ATL::_AtlGetConversionACP() /*CP_THREAD_ACP*/; (_acp); LPCWSTR _lpw; (_lpw); LPCSTR _lpa; (_lpa) 


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Preprocessor Directives to define function macros with multiple if/else if statements

Preprocessor Directives to define function macros with multiple if/else if statements


By : Ami Heitner
Date : March 29 2020, 07:55 AM
hope this fix your issue I am using Preprocessor Directives to define function macros in C. Can I have multiple if/else if statements in a function macro? , Try it out like this:
code :
#define WRITE(str,id) str(id)

// HERES where I am having difficulty
#define DRAW_GENERIC_WINDOW(windowID, type) if (type==1) \
WRITE(draw_text,windowID) \
else if (type==2) \
WRITE(draw_image,windowID) \
else if (type==3) \
WRITE(draw_hyperlink,windowID)

// usage
DRAW_GENERIC_WINDOW(112, 1);
DRAW_GENERIC_WINDOW(178, 2);
DRAW_GENERIC_WINDOW(988, 3);
Writing macros which generate statements

Writing macros which generate statements


By : William Estrada
Date : March 29 2020, 07:55 AM
should help you out Yes, that's right. Declarations/definitions aren't expressions, so they need to be wrapped into Unit-returning blocks to become ones. Typically Scala does this automatically, but in this particular case you need to do it yourself.
However if you wrap a definition in a block, then it becomes invisible from the outside. That's the limitation of the current macro system that strictly follows the metaphor of "macro application is very much similar to a typed function call". Function calls don't bring new members into scope, so neither do def macros - both for technical and philosophical reasons. As shown in the example #3 of my recent "What Are Macros Good For?" talk, by using structural types def macros can work around this limitation, but this doesn't look particularly related to your question, so I'll omit the details.
Using preprocessor statements for Macros in C

Using preprocessor statements for Macros in C


By : Steve Santos
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The C preprocessor doesn't really work the way you intend to use it. In particular, you cannot use other CPP directives (like #if, ...) in the expansion of a macro. Besides, since macro expansion is a static compile-time feature, this wouldn't help anyway, when the actual shift-values are only known at run-time:
code :
int value_to_shift = read_some_integer_from_user();
int amount_to_shift_by = read_another_integer_from_user();
int shifted_value = SHIFT(value_to_shift, amount_to_shift_by);
#define SHIFT(value, n)   ( (n) < 0? ((value) >> (-n)) : ((value) << (n)) )
static int 
shift(int value, int nbits)
{
    return nbits < 0? (value >> -nbits) : (value << nbits);
}
If Statements in Macros in Excel

If Statements in Macros in Excel


By : joycestick
Date : March 29 2020, 07:55 AM
Hope this helps I originally had a macro written that would clear the specified cells in an excel sheet but I want to be able to only clear certain rows if I need to. This is what my macro looks like currently. , You can loop through rows 4 -30:
code :
Sub Rectangle1_Click()
    Dim lRow As Long
    If MsgBox("Are you sure?", vbYesNo + vbQuestion) = vbYes Then
        For lRow = 4 To 30
            With ActiveSheet
                If .Cells(lRow, "I").Value = 1 Then
                    .Cells(lRow, "A").Resize(1, 3).ClearContents
                    .Cells(lRow, "G").Resize(1, 2).ClearContents
                End If
            End With
        Next lRow
    Else
        MsgBox "OK", vbOKOnly + vbInformation
    End If
End Sub
Excel multiple if statements to run multiple macros

Excel multiple if statements to run multiple macros


By : user1831426
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I have several objects in my Excel and I am exporting them with my macro1, macro2 and macro3. I use "mainmacro" to run all this process. I also have Checkboxes (Form Controls) to choose what objects should be exported. So if Checkbox 1 is checked I have "TRUE" in cell B1 if it is unchecked then in B1 is "FALSE". Same with Checkbox 2 -> B2, Checkbox 3 -> B3. , Close your IF statements since they are independent of each other:
code :
If ws.Range("B1").Value = True Then
        macro1
End If

If ws.Range("B2").Value = True Then
        macro2
End If

If ws.Range("B3").Value = True Then
        macro3
End If
If ws.Range("B1").Value = True Then macro1

If ws.Range("B2").Value = True Then macro2

If ws.Range("B3").Value = True Then macro3
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