[boost] boost::indeterminate and std::vector::emplace_back()

Subject: [boost] boost::indeterminate and std::vector::emplace_back()
From: Arno Schödl (aschoedl_at_[hidden])
Date: 2012-04-04 13:18:17

Hi,

there is a problem when using boost::indeterminate in conjunction with
std::vector::emplace_back:

        std::vector<boost::tribool> v;
        v.emplace_back(boost::indeterminate);

In VS2010, this code causes

        error C2383: '_Valty' : default-arguments are not allowed on this symbol

The error occurs becasue emplace_back's _Valty template parameter is deduced as the type of boost::indeterminate which is a function with a default argument.

What is the recommended way to explicitly create an "indeterminate" tribool value in cases like this?

Regards,

Arno

--
Dr. Arno Schödl | aschoedl_at_[hidden]
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