Format specifier for (wxString() << x)

[Rob']

I'm using this simple macro to convert a number to it's string representation:

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#define AS_STRING(x) (wxString() << x)

Is it possible to specify a format? I want to prevent the scientific notification in the resulting string.

Thanks in advance.
Rob'

[Manolo]

http://docs.wxwidgets.org/3.0/classwx_s ... bf034d0be0
The format is the same as the standard C++ printf().
Example:

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wxString myRes = wxString::Format("number is %f.3", x);

[Rob']

I'm using this macro for integer as well for floating point variables w/o to notice the type.
In this case I have an integer variable. For small values I get the string in decimal notation as desired, whereas for large integer values it appears in scientific notation. Is it possible to get the decimal notation also for large values?

Rob'

[eranon]

Do you have an example to show about what's displayed by the code below when n is a large number?

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wxMessageBox(wxString::Format("n = %.3f", n));

[Manolo]

wxString operator "<<" is overloaded (see /include/wx/string.h around line 2000). It uses default %d, %u, %f etc format specificers.

If you want specific format and also allow different types then you need to do the overloads on your own.
Something like this (untested):

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class myString
{
public:
    wxString& operator<<(int i)
        { return wxString::Format("%d", i); }
    wxString& operator<<(unsigned int ui)
        { return wxString::Format("%u", ui); }
    wxString& operator<<(float f)
        { return wxString::Format("%f", f); }
    wxString& operator<<(double d)
        { return wxString::Format("%f", d); } //using "%g" would chose exponential for big values
   ----  long, unsigned long, long long, etc
}

#define AS_WXSTRING(x) (myString() << x)

Anyhow, my example also use default decimal positions. You need more complex code if you want a variable number of decimals depending on passed value.