No Match for Call

[Atomic_Sheep]

Hi, I've got the following code:

file1.h

#include "file2.h"
#include <QString>
 
struct ChartProperties
{
    QString yvar;
};

#include "file2.h"
#include <QString>

struct ChartProperties
{
    QString yvar;
};

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file1.cpp

ChartProperties chart1;
if(VariablePresent(chart1.yvar) //etc

ChartProperties chart1;
if(VariablePresent(chart1.yvar) //etc

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file 2.h

#include "file1.h"
#include <QFile>
 
bool VariablesPresent(QString userVariable);

#include "file1.h"
#include <QFile>

bool VariablesPresent(QString userVariable);

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file2.cpp

bool VariablesPresent(QString userVariable)
{
    QFile cVariableEquivalents(//actual system path);
    if(!cVariableEquivalents().exists())
    //etc
}

bool VariablesPresent(QString userVariable)
{
    QFile cVariableEquivalents(//actual system path);
    if(!cVariableEquivalents().exists())
    //etc
}

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I may have missed one or two includes here or there... I've got them in my program, so the problem isn't with the includes I don't think.

The error that I get at compile is:

no match for call to '(QFile) ()'

Any ideas on what I'm doing wrong?

[stampede]

Can you show unmodified part of code that gives you this compilation error ?

[norobro]

no match for call to '(QFile) ()'

The problem is in file2.cpp line #4: cVariableEquivalents()

[ChrisW67]

Line 3 of file2.cpp is in error. You have commented out the closing bracket so that once the pre-processor is finished with it the code reads:

bool VariablesPresent(QString userVariable)
{
    QFile cVariableEquivalents(
    if(!cVariableEquivalents().exists())
 
}

bool VariablesPresent(QString userVariable)
{
    QFile cVariableEquivalents(
    if(!cVariableEquivalents().exists())

}

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which clearly makes no sense. The brackets in that line are unnecessary anyway.

Also, the function is called VariablesPresent() but you try to call VariablePresent(), which will not compile either.

[Atomic_Sheep]

Ok, here's the unmodified version well excerpts at least:

comparison.h

#include <QMainWindow>
#include <QFile>
#include <QDir>
#include <QString>
#include <QTextStream>
#include <QMessageBox>
#include "ui_comparison.h"
#include "filemanager.h"
 
public:
    struct ChartProperties
    {
        QString yAxisVariable;
        QString xAxisVariable;
    };

#include <QMainWindow>
#include <QFile>
#include <QDir>
#include <QString>
#include <QTextStream>
#include <QMessageBox>
#include "ui_comparison.h"
#include "filemanager.h"

public:
    struct ChartProperties
    {
        QString yAxisVariable;
        QString xAxisVariable;
    };

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comparison.cpp

#include "comparison.h"
 
if(VariablesPresent(sChart1.yAxisVariable) && VariablesPresent(sChart1.xAxisVariable))

#include "comparison.h"

if(VariablesPresent(sChart1.yAxisVariable) && VariablesPresent(sChart1.xAxisVariable))

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P.S. the && part wasn't included when I tried to compile it, I've added it later on top of the error and currently am just waiting to get this error fixed to see if this && part is going to cause problems later on in the code.

filemanager.h

#include <QFile>
#include <QDir>
#include <QString>
#include <comparison.h>
#include <QTextStream>
 
bool VariablesPresent(QString userVariable);

#include <QFile>
#include <QDir>
#include <QString>
#include <comparison.h>
#include <QTextStream>

bool VariablesPresent(QString userVariable);

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filemanager.cpp

#include "filemanager.h"
 
bool VariablesPresent(QString userVariable)
{
    QFile cVariableEquivalents("/*directory*/");
    if(!cVariableEquivalents().exists())

#include "filemanager.h"

bool VariablesPresent(QString userVariable)
{
    QFile cVariableEquivalents("/*directory*/");
    if(!cVariableEquivalents().exists())

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etc...

P.P.S. I'm not sure if bool is what I need but I'm using it for now, might change the function later on.

[ChrisW67]

The problem is still, as norobro pointed out earlier, with line 6 of filemanager.cpp (formerly file2.cpp line 4). You are trying to call QFile::operator() and it doesn't exist, which is precisely what the compiler is telling you. The line should read:

...
if(!cVariableEquivalents.exists())  
...

...
if(!cVariableEquivalents.exists())  
...

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but it will only do something sensible if line 5 actually contains something likely to be a file name.

[Atomic_Sheep]

OOOOOH, thanks, simple fix... I just had to remove the () brackets from all subsequent uses and now it's all good, thanks.