73 lines
2.9 KiB
C++
73 lines
2.9 KiB
C++
#pragma once
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#include "find_reflection_handler.h"
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#include <cgv/config/cpp_version.h>
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#include "lib_begin.h"
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namespace cgv {
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namespace reflect {
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/** provides access to a member variable of an instance. Use the cgv::reflect::get_member() function for simplest usage of this class. */
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class CGV_API get_reflection_handler : public find_reflection_handler
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{
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protected:
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void* value_ptr;
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std::string value_type;
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abst_reflection_traits* value_rt;
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public:
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/// construct from target, value type and pointer to value
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get_reflection_handler(const std::string& _target,
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const std::string& _value_type,
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void* _value_ptr,
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abst_reflection_traits* _value_rt = 0);
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/// construct from target, pointer to value and reflection_traits
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get_reflection_handler(const std::string& _target, void* _value_ptr, abst_reflection_traits* _value_rt);
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/// copy value of member to external value pointer
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void process_member_void(const std::string& member_name, void* member_ptr,
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abst_reflection_traits* rt, GroupKind group_kind, unsigned grp_size);
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};
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#ifdef REFLECT_TRAITS_WITH_DECLTYPE
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//! uses cgv::reflect::get_reflection_handler to copy the value of a member from an instance
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/*! \param[in] variable Instance whoes member should be copied
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\param[in] target Specification of member (see cgv::reflect::find_reflection_handler for details)
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\param[out] value Copy member into to this location.
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*/
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template <typename T, typename Q>
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bool get_member(T& variable, const std::string& target, Q& value) {
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reflection_traits_info<Q>::traits_type rt_value;
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#else
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namespace compatibility {
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template <typename T, typename Q, typename RQ>
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bool get_member_impl(T& variable, const std::string& target, Q& value, RQ&) {
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RQ rt_value;
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#endif
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get_reflection_handler grh(target, &value, &rt_value);
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grh.reflect_member("", variable);
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return grh.found_valid_target();
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}
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#ifndef REFLECT_TRAITS_WITH_DECLTYPE
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template <bool use_get, typename T, typename Q>
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struct get_member_dispatch { static bool get_member(T& variable, const std::string& target, Q& value) {
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return get_member_impl(variable, target, value, reflection_traits<Q>()); } };
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template <typename T, typename Q>
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struct get_member_dispatch<true,T,Q> { static bool get_member(T& variable, const std::string& target, Q& value) {
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return get_member_impl(variable, target, value, get_reflection_traits(value)); } };
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}
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//! uses cgv::reflect::get_reflection_handler to copy the value of a member from an instance
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/*! \param[in] variable Instance whoes member should be copied
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\param[in] target Specification of member (see cgv::reflect::find_reflection_handler for details)
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\param[out] value Copy member into to this location.
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*/
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template <typename T, typename Q>
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bool get_member(T& variable, const std::string& target, Q& value)
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{
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return compatibility::get_member_dispatch<reflection_traits_info<Q>::use_get,T,Q>::get_member(variable, target, value);
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}
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#endif
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}
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}
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#include <cgv/config/lib_end.h> |