/usr/include/Wt/WBoostAny is in libwt-dev 3.3.3+dfsg-4.1.
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/*
* Copyright (C) 2010 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/
#ifndef WBOOST_ANY_H_
#define WBOOST_ANY_H_
#include <Wt/WGlobal>
#include <Wt/WString>
#include <boost/any.hpp>
#include <boost/lexical_cast.hpp>
namespace Wt {
/*! \brief A traits class for a type stored in a boost::any.
*
* The traits are used by %Wt's view classes (such as Wt::WTableView
* Wt::WTreeView, Wt::Chart::WCartesianChart) to deal with values in a
* Wt::WAbstractItemModel:
* - conversion to a string by Wt::asString()
* - conversion to a number by Wt::asNumber()
* - sorting by Wt::WSortFilterProxyModel or WStandardItemModel.
*
* This traits class provides a default implementation for supporting
* values <i>value</i> of a custom type <i>Type</i> in %Wt's MVC system,
* which relies on:
* - serializing to a stream (std::ostream << <i>value</i>) for converting the
* value to a string.
* - lexical interpretation as a number for converting the value to a number,
* using boost::lexical_cast<double>(value).
* - sorting using operator== and operator<
*
* You can specialize these traits if you need to customize one or more of these
* operations.
*
* \ingroup modelview
*/
template <typename Type>
struct boost_any_traits {
/*! \brief Converts a value to a string.
*
* The default implementation uses a boost::lexical_cast, and thus
* an overloaded std::ostream<< operator for the value.
*/
static WString asString(const Type& value, const WString& format);
/*! \brief Converts a value to a number.
*
* The default implementation returns:
* \code
* boost::lexical_cast<double>(asString(v), "")
* \endcode
*/
static double asNumber(const Type& v);
/*! \brief Compares two values.
*
* The default implementation uses operator== and operator<.
*/
static int compare(const Type& v1, const Type& v2);
};
/*! \brief Interprets a boost::any as a string value.
*
* The conversion works as follows:
* - A boost::any without a value is converted to an empty string
* - Number values (integers and doubles) are formatted using the
* format string with <i>snprintf()</i>, or with
* <i>boost::lexical_cast<></i> if the format string is empty.
* - Data of type WDate is converted with WDate::toString() using the indicated
* format string. If the format string is empty, "dd/MM/yy" is assumed.
* - Data of type WTime is converted with WTime::toString() using the indicated
* format string. If the format string is emtpy, "HH:mm:ss" is assumed.
* - Data of type WDateTime is converted with WDateTime::toString() using the
* indicated format string. If the format string is empty,
* "dd/MM/yy HH:mm:ss" is assumed.
*
* Other types are converted according to
* Wt::boost_any_traits<Type>::asString(). For these other types, you need
* to register their support first using Wt::registerType<Type>() and you may
* want to specialize Wt::boost_any_traits<Type> for a custom handling of
* their conversions.
*
* \sa asNumber(), boost_any_traits
*
* \ingroup modelview
*/
#ifdef DOXYGEN_ONLY
extern WString asString(const boost::any& v,
const WT_USTRING& formatString = WT_USTRING());
#else
extern WT_API WString asString(const boost::any& v,
const WT_USTRING& formatString = WT_USTRING());
#endif
/*! \brief Interprets a boost::any as a number value.
*
* The conversion works as follows:
* - A boost::any without a value, or a string that does not represent a
* number, is converted to a <i>NaN</i>.
* - A string is lexically casted to a double
* - Data of type WDate is converted to an integer number using
* WDate::toJulianDay().
* - Data of type WDateTime is converted to an integer number using
* WDateTime::toTime_t().
* - Data of type WTime is converted to an integer number as the number of
* milliseconds since midnight.
*
* Other types are converted according to
* Wt::boost_any_traits<Type>::asNumber(). For these other types, you need to
* register their support first using Wt::registerType<Type>() and you may
* want to specialize Wt::boost_any_traits<Type> for a custom handling of
* their conversions.
*
* \sa asString(), boost_any_traits
*
* \ingroup modelview
*/
#ifdef DOXYGEN_ONLY
extern double asNumber(const boost::any& v);
#else
extern WT_API double asNumber(const boost::any& v);
#endif // DOXYGEN_ONLY
/*
* Converts a value of one type to a value of another type, using a
* WString as an intermediate form.
*/
extern WT_API boost::any
convertAnyToAny(const boost::any& v,
const std::type_info& type,
const WT_USTRING& formatString = WT_USTRING());
/*! \brief Registers MVC-support for a type passed in a boost::any.
*
* By registering a type using this method, the global function
* Wt::asString(), which converts a boost::any to a string, will know
* how to interpret a boost::any holding a value of type \p Type using
* Wt::boost_any_traits<Type>::asString(). This gives %Wt's built-in
* standard View classes the ability to display Wt::DisplayRole data
* of a Wt::WAbstractItemModel model.
*
* Similarly, Wt::asNumber() uses
* Wt::boost_any_traits<Type>::asNumber() for use by
* Wt::Chart::WCartesianChart and Wt::Chart::WPieChart as numerical
* data.
*
* The default implementation of Wt::boost_any_traits<Type> converts a
* value \p t to a Wt::WString by using
* boost::lexical_cast<std::string>() which it expects to return a
* UTF-8 string. This conversion thus relies on the std::ostream<<
* operator to be overloaded for the type. You may want to specialize
* Wt::boost_any_traits to provide a custom conversion for a type, or if
* you want to take into account the format string.
*
* The following types are registered by %Wt itself:
* - strings of type WString or std::string
* - WDate, WTime, WDateTime
* - standard C++ numeric types (int, double, etc...)
* - bool
*
* This method is thread-safe, and it is not an error to register the
* same type multiple times.
*
* \ingroup modelview
*/
template <typename Type> void registerType();
namespace Impl {
class WT_API AbstractTypeHandler {
public:
AbstractTypeHandler();
virtual ~AbstractTypeHandler();
virtual WString asString(const boost::any& v, const WString& format) = 0;
virtual double asNumber(const boost::any& v) = 0;
virtual int compare(const boost::any& v1, const boost::any& v2) = 0;
};
template <typename T>
class TypeHandler : public AbstractTypeHandler {
virtual WString asString(const boost::any& v, const WString& format) {
return boost_any_traits<T>::asString(boost::any_cast<T>(v), format);
}
virtual double asNumber(const boost::any& v) {
return boost_any_traits<T>::asNumber(boost::any_cast<T>(v));
}
virtual int compare(const boost::any& v1, const boost::any& v2) {
return boost_any_traits<T>::compare(boost::any_cast<T>(v1),
boost::any_cast<T>(v2));
}
};
extern WT_API AbstractTypeHandler *getRegisteredType(const std::type_info *type,
bool takeLock);
extern WT_API void registerType(const std::type_info *type,
AbstractTypeHandler *handler);
extern WT_API void lockTypeRegistry();
extern WT_API void unlockTypeRegistry();
extern WT_API bool matchValue(const boost::any& value,
const boost::any& query,
WFlags<MatchFlag> flags);
extern WT_API int compare(const boost::any& d1, const boost::any& d2);
extern WT_API boost::any updateFromJS(const boost::any& v, std::string s);
extern WT_API std::string asJSLiteral(const boost::any& v,
TextFormat textFormatbool);
}
template <typename Type> void registerType()
{
Impl::lockTypeRegistry();
try {
if (!Impl::getRegisteredType(&typeid(Type), false))
Impl::registerType(&typeid(Type), new Impl::TypeHandler<Type>());
Impl::unlockTypeRegistry();
} catch (...) {
Impl::unlockTypeRegistry();
throw;
}
}
template <typename Type>
WString boost_any_traits<Type>::asString(const Type& value,
const WString& format)
{
return WString::fromUTF8(boost::lexical_cast<std::string>(value));
}
template <typename Type>
double boost_any_traits<Type>::asNumber(const Type& v)
{
return boost::lexical_cast<double>(asString(v, WString::Empty).toUTF8());
}
template <typename Type>
int boost_any_traits<Type>::compare(const Type& v1, const Type& v2)
{
return v1 == v2 ? 0 : (v1 < v2 ? -1 : 1);
}
}
#endif // WBOOST_ANY_H_
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