Microsoft KB Archive/171064

= FIX: C2512 Instantiating Template in Member Initializer =

Article ID: 171064

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft C++ 32-bit Compiler 1.0

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This article was previously published under Q171064



SYMPTOMS
When a member initializer instantiates a template class that takes a const parameter in its constructor, you may receive the following error:

error C2512: no appropriate default constructor available



RESOLUTION
Declare a global object of the template class specialization that is used in the member initializer. When optimizations are used, this unreferenced global should be optimized away.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Visual C++ version 6.0 for Windows.



MORE INFORMATION
This is a regression from Visual C++ 5.0.

Sample Code
// Compile options needed: none

struct _Tree { _Tree(const int& _Parg) {} };

template struct set { _Tree _Tr; set(const _Pr& _Pred = _Pr) : _Tr(_Pred) {} };

struct Boo {     Boo; set & _xSet; };

//set x; // uncomment for workaround

Boo::Boo : _xSet(*new set ) //C2512 here {}

Additional query words: visual studio service pack

Keywords: kbbug kbfix kbvc600fix KB171064

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