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| author | Remko Tronçon <git@el-tramo.be> | 2009-06-01 08:48:42 (GMT) |
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| committer | Remko Tronçon <git@el-tramo.be> | 2009-06-01 09:24:28 (GMT) |
| commit | 2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch) | |
| tree | d46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/date_time/constrained_value.hpp | |
| download | swift-contrib-2812bddd81f8a1b804c7460f4e14cd0aa393d129.zip swift-contrib-2812bddd81f8a1b804c7460f4e14cd0aa393d129.tar.bz2 | |
Import.
Diffstat (limited to '3rdParty/Boost/boost/date_time/constrained_value.hpp')
| -rw-r--r-- | 3rdParty/Boost/boost/date_time/constrained_value.hpp | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/3rdParty/Boost/boost/date_time/constrained_value.hpp b/3rdParty/Boost/boost/date_time/constrained_value.hpp new file mode 100644 index 0000000..b273dd5 --- /dev/null +++ b/3rdParty/Boost/boost/date_time/constrained_value.hpp @@ -0,0 +1,121 @@ +#ifndef CONSTRAINED_VALUE_HPP___ +#define CONSTRAINED_VALUE_HPP___ + +/* Copyright (c) 2002,2003 CrystalClear Software, Inc. + * Use, modification and distribution is subject to the + * Boost Software License, Version 1.0. (See accompanying + * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) + * Author: Jeff Garland + * $Date: 2008-11-12 14:37:53 -0500 (Wed, 12 Nov 2008) $ + */ + +#include <exception> +#include <stdexcept> +#include <boost/config.hpp> +#include <boost/throw_exception.hpp> +#include <boost/mpl/if.hpp> +#include <boost/type_traits/is_base_of.hpp> + +namespace boost { + +//! Namespace containing constrained_value template and types +namespace CV { + //! Represent a min or max violation type + enum violation_enum {min_violation, max_violation}; + + //! A template to specify a constrained basic value type + /*! This template provides a quick way to generate + * an integer type with a constrained range. The type + * provides for the ability to specify the min, max, and + * and error handling policy. + * + * <b>value policies</b> + * A class that provides the range limits via the min and + * max functions as well as a function on_error that + * determines how errors are handled. A common strategy + * would be to assert or throw and exception. The on_error + * is passed both the current value and the new value that + * is in error. + * + */ + template<class value_policies> + class constrained_value { + public: + typedef typename value_policies::value_type value_type; + // typedef except_type exception_type; + constrained_value(value_type value) : value_((min)()) + { + assign(value); + } + constrained_value& operator=(value_type v) + { + assign(v); + return *this; + } + //! Return the max allowed value (traits method) + static value_type max BOOST_PREVENT_MACRO_SUBSTITUTION () {return (value_policies::max)();} + //! Return the min allowed value (traits method) + static value_type min BOOST_PREVENT_MACRO_SUBSTITUTION () {return (value_policies::min)();} + //! Coerce into the representation type + operator value_type() const {return value_;} + protected: + value_type value_; + private: + void assign(value_type value) + { + //adding 1 below gets rid of a compiler warning which occurs when the + //min_value is 0 and the type is unsigned.... + if (value+1 < (min)()+1) { + value_policies::on_error(value_, value, min_violation); + return; + } + if (value > (max)()) { + value_policies::on_error(value_, value, max_violation); + return; + } + value_ = value; + } +}; + + //! Template to shortcut the constrained_value policy creation process + template<typename rep_type, rep_type min_value, + rep_type max_value, class exception_type> + class simple_exception_policy + { + struct exception_wrapper : public exception_type + { + // In order to support throw_exception mechanism in the BOOST_NO_EXCEPTIONS mode, + // we'll have to provide a way to acquire std::exception from the exception being thrown. + // However, we cannot derive from it, since it would make it interceptable by this class, + // which might not be what the user wanted. + operator std::out_of_range () const + { + // TODO: Make the message more descriptive by using arguments to on_error + return std::out_of_range("constrained value boundary has been violated"); + } + }; + + typedef typename mpl::if_< + is_base_of< std::exception, exception_type >, + exception_type, + exception_wrapper + >::type actual_exception_type; + + public: + typedef rep_type value_type; + static rep_type min BOOST_PREVENT_MACRO_SUBSTITUTION () { return min_value; } + static rep_type max BOOST_PREVENT_MACRO_SUBSTITUTION () { return max_value; } + static void on_error(rep_type, rep_type, violation_enum) + { + boost::throw_exception(actual_exception_type()); + } + }; + + + +} } //namespace CV + + + + +#endif |