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Use the proper derived type of the function_input_iterator in iterator_facade.

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This fixes incorrect final iterator type being used in iterator_facade, which
results in an internal base class being returned from various facade methods.

Reported in https://github.com/boostorg/iterator/issues/75.
This commit is contained in:
Andrey Semashev 2022-11-09 19:17:26 +03:00
parent f82627f2cc
commit 853ba3d3c7
1 changed files with 19 additions and 12 deletions
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31
include/boost/iterator/function_input_iterator.hpp
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@ -28,6 +28,9 @@ namespace boost {
namespace iterators {
template <class Function, class Input>
class function_input_iterator;
namespace impl {
// Computes the return type of an lvalue-call with an empty argument,
@ -46,21 +49,21 @@ namespace iterators {
};
template <class Function, class Input>
class function_input_iterator :
class function_object_input_iterator :
public iterator_facade<
function_input_iterator<Function, Input>,
iterators::function_input_iterator<Function, Input>,
typename result_of_nullary_lvalue_call<Function>::type,
single_pass_traversal_tag,
typename result_of_nullary_lvalue_call<Function>::type const &
>
{
public:
function_input_iterator() {}
function_input_iterator(Function & f_, Input state_ = Input())
function_object_input_iterator() {}
function_object_input_iterator(Function & f_, Input state_ = Input())
: f(boost::addressof(f_)), state(state_) {}
void increment() {
if(value)
if (value)
value = none;
else
(*f)();
@ -69,10 +72,12 @@ namespace iterators {
typename result_of_nullary_lvalue_call<Function>::type const &
dereference() const {
return (value ? value : value = (*f)()).get();
if (!value)
value = (*f)();
return value.get();
}
bool equal(function_input_iterator const & other) const {
bool equal(function_object_input_iterator const & other) const {
return f == other.f && state == other.state;
}
@ -85,7 +90,7 @@ namespace iterators {
template <class Function, class Input>
class function_pointer_input_iterator :
public iterator_facade<
function_pointer_input_iterator<Function, Input>,
iterators::function_input_iterator<Function, Input>,
typename function_types::result_type<Function>::type,
single_pass_traversal_tag,
typename function_types::result_type<Function>::type const &
@ -97,7 +102,7 @@ namespace iterators {
: f(f_), state(state_) {}
void increment() {
if(value)
if (value)
value = none;
else
(*f)();
@ -106,7 +111,9 @@ namespace iterators {
typename function_types::result_type<Function>::type const &
dereference() const {
return (value ? value : value = (*f)()).get();
if (!value)
value = (*f)();
return value.get();
}
bool equal(function_pointer_input_iterator const & other) const {
@ -126,13 +133,13 @@ namespace iterators {
public boost::conditional<
function_types::is_function_pointer<Function>::value,
impl::function_pointer_input_iterator<Function,Input>,
impl::function_input_iterator<Function,Input>
impl::function_object_input_iterator<Function,Input>
>::type
{
typedef typename boost::conditional<
function_types::is_function_pointer<Function>::value,
impl::function_pointer_input_iterator<Function,Input>,
impl::function_input_iterator<Function,Input>
impl::function_object_input_iterator<Function,Input>
>::type base_type;
public:
function_input_iterator(Function & f, Input i)