Support N-ary loader functions if compiling in C++11 mode

[libs/datafile.git] / source / loaderaction.h

diff --git a/source/loaderaction.h b/source/loaderaction.h
index 03a9da7bcc1aa8fc33823f404a0426f704aaeaed..7e4feac613eba7afab54fec62c07b294c28f56ea 100644 (file)
--- a/source/loaderaction.h
+++ b/source/loaderaction.h
@@ -1,19 +1,23 @@
-/* $Id$
-
-This file is part of libmspdatafile
-Copyright © 2008, 2010  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_DATAFILE_LOADERACTION_H_
 #define MSP_DATAFILE_LOADERACTION_H_
 
-#include "except.h"
+#include <msp/core/meta.h>
+#include "argumentstore.h"
 #include "statement.h"
 
 namespace Msp {
 namespace DataFile {
 
+#if __cplusplus>=201103L
+template<typename T>
+std::string create_signature(const std::string &prefix = std::string())
+{ return prefix+std::string(1, TypeInfo<T>::signature); }
+
+template<typename T0, typename T1, typename... Tail>
+std::string create_signature(const std::string &prefix = std::string())
+{ return create_signature<T1, Tail...>(prefix+std::string(1, TypeInfo<T0>::signature)); }
+#endif
+
 class Loader;
 
 /**
@@ -29,6 +33,8 @@ public:
        /** Called to process a statement. */
        virtual void execute(Loader &, const Statement &) const = 0;
 
+       virtual void execute(Loader &, const ArgumentStore &) const = 0;
+
        virtual std::string get_signature() const = 0;
 };
 
@@ -52,6 +58,11 @@ public:
                (dynamic_cast<L &>(l).*func)();
        };
 
+       virtual void execute(Loader &l, const ArgumentStore &) const
+       {
+               (dynamic_cast<L &>(l).*func)();
+       };
+
        virtual std::string get_signature() const
        { return std::string(); }
 };
@@ -76,6 +87,11 @@ public:
                (dynamic_cast<L &>(l).*func)(st.args[0].get<A0>());
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               (dynamic_cast<L &>(l).*func)(as.get<A0>(0));
+       }
+
        virtual std::string get_signature() const
        { return std::string(1, TypeInfo<A0>::signature); }
 };
@@ -104,6 +120,16 @@ public:
                (dynamic_cast<L &>(l).*func)(values);
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               std::vector<A0> values;
+               unsigned n_args = as.get_info().key.signature.size();
+               values.reserve(n_args);
+               for(unsigned i=0; i<n_args; ++i)
+                       values.push_back(as.get<A0>(i));
+               (dynamic_cast<L &>(l).*func)(values);
+       }
+
        virtual std::string get_signature() const
        {
                std::string result;
@@ -133,6 +159,11 @@ public:
                (dynamic_cast<L &>(l).*func)(st);
        }
 
+       virtual void execute(Loader &, const ArgumentStore &) const
+       {
+               throw std::logic_error("incompatible format");
+       }
+
        virtual std::string get_signature() const
        { return "*"; }
 };
@@ -154,6 +185,11 @@ public:
                (dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>());
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               (dynamic_cast<L &>(l).*func)(as.get<A0>(0), as.get<A1>(1));
+       }
+
        virtual std::string get_signature() const
        {
                std::string result;
@@ -180,6 +216,11 @@ public:
                (dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>(), st.args[2].get<A2>());
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               (dynamic_cast<L &>(l).*func)(as.get<A0>(0), as.get<A1>(1), as.get<A2>(2));
+       }
+
        virtual std::string get_signature() const
        {
                std::string result;
@@ -207,6 +248,11 @@ public:
                (dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>(), st.args[2].get<A2>(), st.args[3].get<A3>());
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               (dynamic_cast<L &>(l).*func)(as.get<A0>(0), as.get<A1>(1), as.get<A2>(2), as.get<A3>(3));
+       }
+
        virtual std::string get_signature() const
        {
                std::string result;
@@ -235,6 +281,11 @@ public:
                (dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>(), st.args[2].get<A2>(), st.args[3].get<A3>(), st.args[4].get<A4>());
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               (dynamic_cast<L &>(l).*func)(as.get<A0>(0), as.get<A1>(1), as.get<A2>(2), as.get<A3>(3), as.get<A4>(4));
+       }
+
        virtual std::string get_signature() const
        {
                std::string result;
@@ -248,6 +299,71 @@ public:
 };
 
 
+#if __cplusplus>=201103L
+template<unsigned I, typename... Args>
+struct Apply;
+
+template<unsigned I>
+struct Apply<I>
+{
+       template<typename L, typename F, typename... Args>
+       static void apply(L &l, F func, const Statement &, Args... args)
+       {
+               (l.*func)(args...);
+       }
+
+       template<typename L, typename F, typename... Args>
+       static void apply(L &l, F func, const ArgumentStore &, Args... args)
+       {
+               (l.*func)(args...);
+       }
+};
+
+template<unsigned I, typename Head, typename... Tail>
+struct Apply<I, Head, Tail...>
+{
+       template<typename L, typename F, typename... Args>
+       static void apply(L &l, F func, const Statement &st, Args... args)
+       {
+               Apply<I+1, Tail...>::apply(l, func, st, args..., st.args[I].get<Head>());
+       }
+
+       template<typename L, typename F, typename... Args>
+       static void apply(L &l, F func, const ArgumentStore &as, Args... args)
+       {
+               Apply<I+1, Tail...>::apply(l, func, as, args..., as.get<Head>(I));
+       }
+};
+
+
+template<typename L, typename... Args>
+class LoaderFuncN: public LoaderAction
+{
+protected:
+       typedef void (L::*FuncType)(Args...);
+
+       FuncType func;
+
+public:
+       LoaderFuncN(FuncType f): func(f) { }
+
+       virtual void execute(Loader &l, const Statement &st) const
+       {
+               Apply<0, Args...>::apply(dynamic_cast<L &>(l), func, st);
+       }
+
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               Apply<0, Args...>::apply(dynamic_cast<L &>(l), func, as);
+       }
+
+       virtual std::string get_signature() const
+       { return create_signature<Args...>(); }
+};
+
+#endif
+
+
 template<typename L, typename T0>
 class LoadValue1: public LoaderAction
 {
@@ -264,6 +380,11 @@ public:
                dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = st.args[0].get<T0>();
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = as.get<T0>(0);
+       }
+
        virtual std::string get_signature() const
        { return std::string(1, TypeInfo<T0>::signature); }
 };
@@ -283,9 +404,13 @@ public:
        virtual void execute(Loader &l, const Statement &st) const
        {
                typename L::Loader &ldr = dynamic_cast<typename L::Loader &>(l);
-               if(!ldr.is_pointer_reload_allowed() && ldr.get_object().*ptr0)
-                       throw InvalidState("The pointer has already been loaded");
-               ldr.get_object().*ptr0 = ldr.get_collection().template get<T0>(st.args[0].get<std::string>());
+               ldr.get_object().*ptr0 = &ldr.get_collection().template get<T0>(st.args[0].get<std::string>());
+       }
+
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               typename L::Loader &ldr = dynamic_cast<typename L::Loader &>(l);
+               ldr.get_object().*ptr0 = &ldr.get_collection().template get<T0>(as.get<std::string>(0));
        }
 
        virtual std::string get_signature() const
@@ -312,6 +437,12 @@ public:
                dynamic_cast<typename L::Loader &>(l).get_object().*ptr1 = st.args[1].get<T1>();
        }
 
+       virtual void execute(Loader &l, const ArgumentStore &as) const
+       {
+               dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = as.get<T0>(0);
+               dynamic_cast<typename L::Loader &>(l).get_object().*ptr1 = as.get<T1>(1);
+       }
+
        virtual std::string get_signature() const
        {
                std::string result;