在 lib Bullet 中定义了一个类型:
typedef void (*btNearCallback)(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo);
在那里的文档中提供了一个使用示例(第 23 页):
void MyNearCallback(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo) {
// Do your collision logic here
// Only dispatch the Bullet collision information if you want the physics to continue
dispatcher.defaultNearCallback(collisionPair, dispatcher, dispatchInfo);
}
我将此示例代码复制到我的班级防御中,因此我的班级获得了此功能,并且我将能够执行以下转换:
dispatcher->setNearCallback(boost::bind(&BulletAPIWrapper::MyNearCallback, this, _1, _2, _3));
dispatcher->setNearCallback(MyNearCallback);
而不是Bullet 教程中的 C。
然而我的 VS2010 sp1 给了我一个错误:
Error 44 error C2664: 'btCollisionDispatcher::setNearCallback' : cannot convert parameter 1 from 'boost::_bi::bind_t<R,F,L>' to 'btNearCallback'
所以我想知道如何将 boost::bind 转换为这样的 typedef?
是否有可能具有静态类函数(或至少像全局函数):
void MyNearCallback(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo, BulletAPI* api) {
}
称呼dispatcher->setNearCallback( boost::bind(MyNearCallback, _1, _2, _3, this));
因为它对我来说几乎是相同的错误:
Error 44 error C2664: 'btCollisionDispatcher::setNearCallback' : cannot convert parameter 1 from 'boost::_bi::bind_t<R,F,L>' to 'btNearCallback'
我也尝试过这里描述的:
template<unsigned ID,typename Functor>
boost::optional<Functor> &get_local()
{
static boost::optional<Functor> local;
return local;
}
template<unsigned ID,typename Functor>
typename Functor::result_type wrapper(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo)
{
return get_local<ID,Functor>().get()(collisionPair, dispatcher, dispatchInfo);
}
template<typename ReturnType>
struct Func
{
typedef ReturnType (*type)(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo);
};
template<unsigned ID,typename Functor>
typename Func<typename Functor::result_type>::type get_wrapper(Functor f)
{
(get_local<ID,Functor>()) = f;
return wrapper<ID,Functor>;
}
struct NearCallbackWrapper
{
class BulletAPI;
void MyNearCallback(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo) {
std::cout << "called" << std::endl;
}
};
//....
dispatcher->setNearCallback( get_wrapper<0>( boost::bind(&NearCallbackWrapper::MyNearCallback,this) ) );
但是我从中得到了这样的错误:
error C2664: 'btCollisionDispatcher::setNearCallback' : cannot convert parameter 1 from 'void (__cdecl *)(btBroadphasePair &,btCollisionDispatcher &,const btDispatcherInfo &)' to 'btNearCallback'