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Perplexed about "call of overloaded 'xxx' is ambiguous"

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Perplexed about "call of overloaded 'xxx' is ambiguous"

Subject: Perplexed about "call of overloaded 'xxx' is ambiguous"
From: Matt Gough <email@hidden>
Date: Thu, 4 Sep 2008 18:07:31 +0200

I have been getting the above compiler error, but I can't see why.

I have the following two classes:

namespace MyNamespace{
class CUIString
{
public:
	CUIString();
	CUIString(const CUIString&);
	CUIString(const std::wstring& ws_i,	bool aBool = true);
	CUIString(const std::string& s_i,	bool aBool = true);
	CUIString(CFStringRef cf_i,		bool aBool = true);
	CUIString(ConstStr255Param ps_i,	bool aBool = true);
	CUIString(const wchar_t* wchars_i);
	CUIString(const char* chars_i);
	~CUIString();

	operator CFStringRef () const;
	operator const std::wstring& () const;
	operator const std::string& () const;
	operator ConstStringPtr() const;

	CUIString& operator = (const CUIString&);
	CUIString& operator = (CFStringRef);
	CUIString& operator = (const std::wstring&);
	CUIString& operator = (const std::string&);
	CUIString& operator = (ConstStr255Param);
	CUIString& operator = (const wchar_t*);
	CUIString& operator = (const char*);
};
}

class SomeClass {

public:
	MyNamespace::CUIString	GetSomeString() const;
	void			SetSomeString(const MyNamespace::CUIString& someString);
};


and some calling code like this:

// These three all work fine
MyNamespace::CUIString s1;
MyNamespace::CUIString s2(s1);
MyNamespace::CUIString s3 = s2;

// This works fine:
SomeClass someClass1;
SomeClass someClass2;
someClass2.SetSomeString(someClass1.GetSomeString());

// These don't work: MyNamespace::CUIString s4(someClass1.GetSomeString()); MyNamespace::CUIString s5 = someClass1.GetSomeString(); /* error: call of overloaded 'CUIString(MyNamespace::CUIString)' is ambiguous note: candidates are: MyNamespace::CUIString::CUIString(const char*) <near match> note: MyNamespace::CUIString::CUIString(const unsigned char*, bool) note: MyNamespace::CUIString::CUIString(const __CFString*, bool) note: MyNamespace::CUIString::CUIString(const std::string&, bool) note: MyNamespace::CUIString::CUIString(const std::wstring&, bool) note: MyNamespace::CUIString::CUIString(const AppleCore::CUIString&) */

Interestingly if you plop this code in its own file it will probably compile without any problem. Unfortunately this is not the case in my real version of the code. MyNamespace::CUIString and SomeClass are each part of other libraries/projects that are used by the calling code. I suspect that there is some bad interaction between the various library settings but I can see nothing obvious.

Can someone just confirm that I am not going mad. Why is it being considered as ambiguous when CUIString has a CUIString(const CUIString&) constructor ( and operator =(const CUIString&) )?

Thanks

Matt Gough

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Re: Perplexed about "call of overloaded 'xxx' is ambiguous"
From: Tommy Nordgren <email@hidden>


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