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Work around bug in g++4.6

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I'm going to have to start dropping support for older compilers soon.

The 4.6 line is 4 years old now, and 4.7 has these issues fixed
This commit is contained in:
Jason Turner
2015-06-01 15:49:50 -06:00
parent 7026229273
commit 520f9bc0d2
2 changed files with 113 additions and 10 deletions
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4
include/chaiscript/chaiscript_defines.hpp
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@@ -35,6 +35,10 @@
#define CHAISCRIPT_HAS_THREAD_LOCAL
#endif
#if (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ >= 6)
#define CHAISCRIPT_GCC_4_6
#endif
#if (defined(__GNUC__) && __GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7) || defined(CHAISCRIPT_MSVC) || defined(__llvm__)
#define CHAISCRIPT_OVERRIDE override
#else

119
include/chaiscript/dispatchkit/proxy_functions_detail.hpp
View File

@@ -53,6 +53,113 @@ namespace chaiscript
{
namespace detail
{
/**
* Used by Proxy_Function_Impl to return a list of all param types
* it contains.
*/
template<typename Ret, typename ... Params>
std::vector<Type_Info> build_param_type_list(Ret (*)(Params...))
{
/// \note somehow this is responsible for a large part of the code generation
return { user_type<Ret>(), user_type<Params>()... };
}
#ifdef CHAISCRIPT_GCC_4_6
/// \todo REMOVE THIS WHEN WE DROP G++4.6
// Forward declaration
template<typename ... Rest>
struct Try_Cast;
template<typename Param, typename ... Rest>
struct Try_Cast<Param, Rest...>
{
static void do_try(const std::vector<Boxed_Value> &params, size_t generation, const Type_Conversions &t_conversions)
{
boxed_cast<Param>(params[generation], &t_conversions);
Try_Cast<Rest...>::do_try(params, generation+1, t_conversions);
}
};
// 0th case
template<>
struct Try_Cast<>
{
static void do_try(const std::vector<Boxed_Value> &, size_t, const Type_Conversions &)
{
}
};
/**
* Used by Proxy_Function_Impl to determine if it is equivalent to another
* Proxy_Function_Impl object. This function is primarily used to prevent
* registration of two functions with the exact same signatures
*/
template<typename Ret, typename ... Params>
bool compare_types_cast(Ret (*)(Params...),
const std::vector<Boxed_Value> &params, const Type_Conversions &t_conversions)
{
try {
Try_Cast<Params...>::do_try(params, 0, t_conversions);
} catch (const exception::bad_boxed_cast &) {
return false;
}
return true;
}
template<typename Ret, int count, typename ... Params>
struct Call_Func
{
template<typename ... InnerParams>
static Ret do_call(const std::function<Ret (Params...)> &f,
const std::vector<Boxed_Value> &params, const Type_Conversions &t_conversions, InnerParams &&... innerparams)
{
return Call_Func<Ret, count - 1, Params...>::do_call(f, params, t_conversions, std::forward<InnerParams>(innerparams)..., params[sizeof...(Params) - count]);
}
};
template<typename Ret, typename ... Params>
struct Call_Func<Ret, 0, Params...>
{
#ifdef CHAISCRIPT_MSVC
#pragma warning(push)
#pragma warning(disable : 4100) /// Disable unreferenced formal parameter warning, which only shows up in MSVC I don't think there's any way around it \todo evaluate this
#endif
template<typename ... InnerParams>
static Ret do_call(const std::function<Ret (Params...)> &f,
const std::vector<Boxed_Value> &, const Type_Conversions &t_conversions, InnerParams &&... innerparams)
{
return f(boxed_cast<Params>(std::forward<InnerParams>(innerparams), &t_conversions)...);
}
#ifdef CHAISCRIPT_MSVC
#pragma warning(pop)
#endif
};
/**
* Used by Proxy_Function_Impl to perform typesafe execution of a function.
* The function attempts to unbox each parameter to the expected type.
* if any unboxing fails the execution of the function fails and
* the bad_boxed_cast is passed up to the caller.
*/
template<typename Ret, typename ... Params>
Ret call_func(const std::function<Ret (Params...)> &f,
const std::vector<Boxed_Value> &params, const Type_Conversions &t_conversions)
{
if (params.size() == sizeof...(Params))
{
return Call_Func<Ret, sizeof...(Params), Params...>::do_call(f, params, t_conversions);
}
throw exception::arity_error(static_cast<int>(params.size()), sizeof...(Params));
}
#else
template<size_t ... I>
struct Indexes
{
@@ -70,16 +177,6 @@ namespace chaiscript
typedef Indexes<I...> indexes;
};
/**
* Used by Proxy_Function_Impl to return a list of all param types
* it contains.
*/
template<typename Ret, typename ... Params>
std::vector<Type_Info> build_param_type_list(Ret (*)(Params...))
{
/// \note somehow this is responsible for a large part of the code generation
return { user_type<Ret>(), user_type<Params>()... };
}
/**
@@ -135,6 +232,8 @@ namespace chaiscript
throw exception::arity_error(static_cast<int>(params.size()), sizeof...(Params));
}
#endif
}
}