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#ifndef CommonTools_Utils_StringObjectFunction_h
#define CommonTools_Utils_StringObjectFunction_h
/* \class StringCutObjectSelector
*
* \author Luca Lista, INFN
*
* $Id: StringObjectFunction.h,v 1.4 2012/06/26 21:09:37 wmtan Exp $
*/
#include "FWCore/Utilities/interface/EDMException.h"
#include "CommonTools/Utils/interface/parser/ExpressionPtr.h"
#include "CommonTools/Utils/interface/parser/ExpressionBase.h"
#include "CommonTools/Utils/interface/expressionParser.h"
#include "FWCore/Reflection/interface/ObjectWithDict.h"
template <typename T, bool DefaultLazyness = false>
struct StringObjectFunction {
StringObjectFunction(const std::string &expr, bool lazy = DefaultLazyness) : type_(typeid(T)) {
if (!reco::parser::expressionParser<T>(expr, expr_, lazy)) {
throw edm::Exception(edm::errors::Configuration, "failed to parse \"" + expr + "\"");
}
}
StringObjectFunction(const reco::parser::ExpressionPtr &expr) : expr_(expr), type_(typeid(T)) {}
double operator()(const T &t) const {
edm::ObjectWithDict o(type_, const_cast<T *>(&t));
return expr_->value(o);
}
private:
reco::parser::ExpressionPtr expr_;
edm::TypeWithDict type_;
};
template <typename Object>
class sortByStringFunction {
public:
sortByStringFunction(StringObjectFunction<Object> *f) : f_(f) {}
~sortByStringFunction() {}
bool operator()(const Object *o1, const Object *o2) { return (*f_)(*o1) > (*f_)(*o2); }
private:
StringObjectFunction<Object> *f_;
};
#endif
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