C++ Template Help
I think my issues are Template related but I just dont know. I am geting errors like:
error: conversion from '__gnu_cxx::__normal_iterator<FxStreamable* (***)(), std::vector<FxStreamable* (**)(), std::a开发者_如何学Gollocator<FxStreamable* (**)()> > >' to non-scalar type '__gnu_cxx::__normal_iterator<std::pair<FxClassID, FxStreamable* (*)()>*, std::vector<std::pair<FxClassID, FxStreamable* (*)()>, std::allocator<std::pair<FxClassID, FxStreamable* (*)()> > > >' requested
and
no match for 'operator!=' in 'itera1 != ((FxPairRegistry<FxClassID, FxStreamable* (*)()>*)this)->FxPairRegistry<FxClassID, FxStreamable* (*)()>::mRegistryList. std::vector<_Tp, _Alloc>::end [with _Tp = FxStreamable* (**)(), _Alloc = std::allocator<FxStreamable* (**)()>]()'
in code that looks like
for (iter itera1 = mRegistryList.begin(); itera1 != mRegistryList.end(); itera1++)
{
if ((*itera1).first == id)
{
return (*itera1).second;
}
}
Can anyone shed some light on what is going wrong?
UPDATE: mRegistryList is defined vector<registeredObject *> mRegistryList;
UPDATE: itera is define typedef typename std::vector<pair<identifier,registeredObject> >::iterator iter;
UPDATE 3:
template <class identifier,class registeredObject> registeredObject FxPairRegistry<identifier,registeredObject>::GetEntry(identifier id, FxBool assertValue)
{
for (std::vector<registeredObject *>::iterator itera1 = mRegistryList.begin(); itera1 != mRegistryList.end(); itera1++)
{
if ((*itera1).first == id)
{
return (*itera1).second;
}
}
if (assertValue)
ASSERT_MSG(0,"Entry not found in the registry");
return NULL;
}
Your iterator type doesn't match the mRegistryList
vector
's iterator type.
iterator: std::vector<std::pair<FxClassID, FxStreamable* (*)()> >::iterator
container: std::vector<FxStreamable* (**)()>
EDIT: In response to update:
Use vector<registeredObject *>::iterator
- not your other unrelated iterator.
In order to iterate over a vector<X>
container, you need a vector<X>::iterator
not a vector<SomethingElse>::iterator
EDIT: In response to new update:
for (typename std::vector<registeredObject *>::iterator itera1 = mRegistryList.begin(); itera1 != mRegistryList.end(); itera1++)
^^^^^^^^
Since this code is in a template, the compiler doesn't know that std::vector<registeredObject *>::iterator
is a type - you have to tell it to treat it as a type by prefixing typename
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