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#ifndef ADHOCUTIL_REFLECTION_H
#define ADHOCUTIL_REFLECTION_H
#include <boost/lexical_cast.hpp>
#include <functional>
#include <istream>
#include <map>
#include <memory>
#include <string>
#ifndef yyFlexLexer
# define yyFlexLexer nvpBaseFlexLexer
# include <FlexLexer.h>
#endif
#include "c++11Helpers.h"
#include "visibility.h"
namespace AdHoc {
/// Name=Value parser.
/**
* Parses an input stream of the format Name=Value;Name2=Value2;... into a predefined object
* structure.
*/
class NvpParse : public yyFlexLexer {
public:
/// @cond
/// Thrown in the event of the input referring to a member that doesn't exist.
class ValueNotFound : public std::runtime_error {
public:
explicit ValueNotFound(const std::string &);
};
using AssignFunc = std::function<void(const std::string &)>;
using AssignMap = std::map<std::string, AssignFunc>;
template<typename T> class TargetBase {
public:
TargetBase() = default;
virtual ~TargetBase() = default;
virtual AssignFunc assign(T *) const = 0;
SPECIAL_MEMBERS_DEFAULT(TargetBase);
};
template<typename T, typename V> class Target : public TargetBase<T> {
public:
explicit Target(V T::*t) : target(t) { }
AssignFunc
assign(T * t) const override
{
return [t, this](const std::string & value) {
t->*target = boost::lexical_cast<V>(value);
};
}
private:
V T::*target;
};
/// @endcond
#define NvpTarget(T) std::map<std::string, std::shared_ptr<::AdHoc::NvpParse::TargetBase<T>>>
#define NvpValue(c, m) \
{ \
# m, std::make_shared < ::AdHoc::NvpParse::Target < c, decltype(c::m)>>(&c::m) \
}
/** Parse an input stream into the given object.
* @param in The input stream.
* @param tm The Target Map for the object.
* @param t The target instance to populate.
*/
template<typename T>
static void
parse(std::istream & in, const NvpTarget(T) & tm, T & t)
{
NvpParse::AssignMap am;
for (const auto & v : tm) {
am[v.first] = v.second->assign(&t);
}
return parse(in, am);
}
/** Don't use this function directly, instead use:
* @code {.cpp} void parse(std::istream & in, const NvpTarget(T) & tm, T & t) @endcode
*/
DLL_PUBLIC static void parse(std::istream & in, const AssignMap & m);
private:
NvpParse(std::istream & in, const AssignMap &);
int yylex() override;
void LexerError(const char * msg) override;
void process(const std::string & value) const;
std::string name;
const AssignMap values;
};
}
#endif
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