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1 // Copyright Daniel Wallin, David Abrahams 2005. Use, modification and |
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2 // distribution is subject to the Boost Software License, Version 1.0. (See |
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3 // accompanying file LICENSE_1_0.txt or copy at |
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4 // http://www.boost.org/LICENSE_1_0.txt) |
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5 |
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6 #ifndef YESNO_050328_HPP |
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7 #define YESNO_050328_HPP |
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8 |
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9 #include <boost/mpl/bool.hpp> |
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10 |
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11 namespace boost { namespace parameter { namespace aux { |
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12 |
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13 // types used with the "sizeof trick" to capture the results of |
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14 // overload resolution at compile-time. |
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15 typedef char yes_tag; |
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16 typedef char (&no_tag)[2]; |
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17 |
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18 // mpl::true_ and mpl::false_ are not distinguishable by sizeof(), |
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19 // so we pass them through these functions to get a type that is. |
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20 yes_tag to_yesno(mpl::true_); |
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21 no_tag to_yesno(mpl::false_); |
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22 |
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23 }}} // namespace boost::parameter::aux |
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24 |
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25 #endif // YESNO_050328_HPP |
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26 |