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Sdk/LuaBinding: Add support for component binding without default constructor (will throw a lua error)

This commit is contained in:
Jérôme Leclercq 2017-07-27 11:41:13 +02:00
parent 6047018082
commit 326fb930af
1 changed files with 32 additions and 14 deletions
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46
SDK/include/NDK/Lua/LuaBinding.inl
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@ -6,6 +6,35 @@
namespace Ndk namespace Ndk
{ {
namespace Detail
{
template<bool HasDefaultConstructor>
struct AddComponentIf;
template<>
struct AddComponentIf<true>
{
template<typename T>
static int AddComponent(Nz::LuaState& lua, EntityHandle& handle)
{
T& component = handle->AddComponent<T>();
lua.Push(component.CreateHandle());
return 1;
}
};
template<>
struct AddComponentIf<false>
{
template<typename T>
static int AddComponent(Nz::LuaState& lua, EntityHandle& /*handle*/)
{
lua.Error("Component has no default constructor and cannot be created from Lua yet");
return 0;
}
};
}
/*! /*!
* \brief Binds a component to a name * \brief Binds a component to a name
* *
@ -13,14 +42,15 @@ namespace Ndk
* *
* \remark Produces a NazaraAssert if name is empty * \remark Produces a NazaraAssert if name is empty
*/ */
template<typename T> template<typename T>
void LuaBinding::BindComponent(const Nz::String& name) void LuaBinding::BindComponent(const Nz::String& name)
{ {
NazaraAssert(!name.IsEmpty(), "Component name cannot be empty"); NazaraAssert(!name.IsEmpty(), "Component name cannot be empty");
static_assert(std::is_base_of<BaseComponent, T>::value, "ComponentType must inherit BaseComponent");
ComponentBinding binding; ComponentBinding binding;
binding.adder = &AddComponentOfType<T>; binding.adder = &Detail::AddComponentIf<std::is_default_constructible<T>::value>::AddComponent<T>;
binding.getter = &PushComponentOfType<T>; binding.getter = &PushComponentOfType<T>;
binding.index = T::componentIndex; binding.index = T::componentIndex;
binding.name = name; binding.name = name;
@ -32,21 +62,9 @@ namespace Ndk
m_componentBindingByName[name] = T::componentIndex; m_componentBindingByName[name] = T::componentIndex;
} }
template<typename T>
int LuaBinding::AddComponentOfType(Nz::LuaState& lua, EntityHandle& handle)
{
static_assert(std::is_base_of<BaseComponent, T>::value, "ComponentType must inherit BaseComponent");
T& component = handle->AddComponent<T>();
lua.Push(component.CreateHandle());
return 1;
}
template<typename T> template<typename T>
int LuaBinding::PushComponentOfType(Nz::LuaState& lua, BaseComponent& component) int LuaBinding::PushComponentOfType(Nz::LuaState& lua, BaseComponent& component)
{ {
static_assert(std::is_base_of<BaseComponent, T>::value, "ComponentType must inherit BaseComponent");
T& rightComponent = static_cast<T&>(component); T& rightComponent = static_cast<T&>(component);
lua.Push(rightComponent.CreateHandle()); lua.Push(rightComponent.CreateHandle());
return 1; return 1;