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編譯下面的代碼與Visual Studio 2010：基類未定義的Visual Studio 2010
#include "filter.h"
#include "filter_table.h"
#include "scene.h"
#include "common.h"
using namespace std;
class absval_filter : public typed_map_filter<float> {
public:
absval_filter(filter_input *input) : typed_map_filter<float>(input) {}
bool compute(const filter_param_set *params, bool adding, float &res, bool &changed) {
float newres;
if (params->empty()) {
return false;
}
filter_val *fv = params->begin()->second;
if (!get_filter_val(fv, newres)) {
return false;
}
newres = fabs(newres);
changed = (newres != res);
res = newres;
return true;
}
};
產生以下的錯誤（線8 =類absval_filter的定義開始）：
Core\SVS\src\filters\absval.cpp(8) : error C2504: 'typed_map_filter' : base class undefined Core\SVS\src\filters\absval.cpp(8) : error C2143: syntax error : missing ',' before '<' Core\SVS\src\filters\absval.cpp(12) : error C4430: missing type specifier - int assumed. >Note: C++ does not support default-int Core\SVS\src\filters\absval.cpp(12) : error C2143: syntax error : missing ',' before '*' Core\SVS\src\filters\absval.cpp(10) : error C2059: syntax error : '<' Core\SVS\src\filters\absval.cpp(14) : error C2065: 'params' : undeclared identifier Core\SVS\src\filters\absval.cpp(14) : error C2227: left of '->empty' must point to >class/struct/union/generic type
type is ''unknown-type'' Core\SVS\src\filters\absval.cpp(17) : error C2065: 'filter_val' : undeclared identifier Core\SVS\src\filters\absval.cpp(17) : error C2065: 'fv' : undeclared identifier Core\SVS\src\filters\absval.cpp(17) : error C2065: 'params' : undeclared identifier Core\SVS\src\filters\absval.cpp(17) : error C2227: left of '->begin' must point to >class/struct/union/generic type
type is ''unknown-type'' Core\SVS\src\filters\absval.cpp(17) : error C2227: left of '->second' must point to >class/struct/union/generic type Core\SVS\src\filters\absval.cpp(18) : error C2065: 'fv' : undeclared identifier Core\SVS\src\filters\absval.cpp(18) : error C3861: 'get_filter_val': identifier not found Core\SVS\src\filters\absval.cpp(21) : error C3861: 'fabs': identifier not found Core\SVS\src\filters\absval.cpp(22) : error C2065: 'changed' : undeclared identifier Core\SVS\src\filters\absval.cpp(22) : error C2065: 'res' : undeclared identifier Core\SVS\src\filters\absval.cpp(23) : error C2065: 'res' : undeclared identifier Core\SVS\src\filters\absval.cpp(29) : error C2065: 'input' : undeclared identifier Core\SVS\src\filters\absval.cpp(29) : fatal error C1903: unable to recover from previous error(s); stopping compilation
類在filter.h中定義了「typed_map_filter」：
#ifndef FILTER_H
#define FILTER_H
#include <iostream>
#include <string>
#include <list>
#include <map>
#include <sstream>
#include <iterator>
#include "linalg.h"
#include "sgnode.h"
#include "scene.h"
#include "common.h"
...
/*
The filter is the basic query unit in SVS. Each filter takes a list of
parameter sets generated by the filter_input class and produces a single
result list. Soar can "mix-and-match" filters by plugging their outputs
into inputs of other filters. This is done by specifying the desired
filter plumbing on the SVS command link.
Filter results are updated once every output phase. Updating a filter's
result is recursive: the filter will first request an update on its
input, which in turn requests updates on all filters feeding into the
input. Filters should also try to cache results when possible to avoid
unnecessary computation.
*/
class filter {
public:
filter() {
input = new null_filter_input();
}
filter(filter_input *in) : input(in) {
if (input == NULL) {
input = new null_filter_input();
}
}
virtual ~filter() {
delete input;
}
std::string get_error() {
return errmsg;
}
bool is_error() {
return !errmsg.empty();
}
void set_error(std::string msg) {
errmsg = msg;
result.clear();
}
void clear_error() {
errmsg.clear();
}
void add_result(filter_val *v, const filter_param_set *p) {
result.add(v);
result2params[v] = p;
}
bool get_result_params(filter_val *v, const filter_param_set *&p) {
return map_get(result2params, v, p);
}
void remove_result(filter_val *v) {
result.remove(v);
result2params.erase(v);
}
void change_result(filter_val *v) {
result.change(v);
}
filter_result *get_result() {
return &result;
}
bool update() {
if (!input->update()) {
set_error("Errors in input");
result.clear();
input->reset();
return false;
}
if (!update_results()) {
result.clear();
input->reset();
return false;
}
input->clear_changes();
return true;
}
const filter_input *get_input() const {
return input;
}
private:
virtual bool update_results() = 0;
filter_input *input;
filter_result result;
std::string errmsg;
std::map<filter_val*, const filter_param_set*> result2params;
};
/*
This type of filter assumes a one-to-one mapping of results to input
parameter sets. It's also assumed that each result is only dependent
on one parameter set. This is in contrast to filters that perform some
kind of quantification over its inputs; returning the closest object,
for example.
*/
class map_filter : public filter {
public:
map_filter(filter_input *input) : filter(input) {}
/*
All created filter_vals are owned by the result list and cleaned
up there, so don't do it here.
*/
virtual ~map_filter() {}
/*
Compute the result from parameters. If called with a new
parameter set, res will be NULL, and the implementation should
set it to a new filter_val object (which will be owned by the
result list). Otherwise, res will point to a valid filter_val and
the implementation should change its value. If the value is
actually changed, the changed output argument should be set to
true. The implementation should return false if an error occurs.
*/
virtual bool compute(const filter_param_set *params, filter_val *&res, bool &changed) = 0;
/*
Some derived classes might allocate memory associated with each
result. They should override this function so they know when
to deallocate that memory.
*/
virtual void result_removed(const filter_val *res) { }
/*
Sometimes the function that maps from parameter set to result
is conditioned on things other than the parameter set, such as
the state of the scene graph. A derived class that implements
such a function should explicitly mark a result as needing to be
recomputed even when its associated parameter set doesn't change.
*/
void mark_stale(const filter_param_set *s) {
stale.push_back(s);
}
bool update_results() {
const filter_input* input = get_input();
std::vector<const filter_param_set*>::iterator j;
for (int i = input->first_added(); i < input->num_current(); ++i) {
filter_val *v = NULL;
bool changed = false;
if (!compute(input->get_current(i), v, changed)) {
return false;
}
add_result(v, input->get_current(i));
io_map[input->get_current(i)] = v;
}
for (int i = 0; i < input->num_removed(); ++i) {
io_map_t::iterator r = io_map.find(input->get_removed(i));
assert(r != io_map.end());
result_removed(r->second);
remove_result(r->second);
io_map.erase(r);
}
for (int i = 0; i < input->num_changed(); ++i) {
if (!update_one(input->get_changed(i))) {
return false;
}
}
for (j = stale.begin(); j != stale.end(); ++j) {
if (!update_one(*j)) {
return false;
}
}
stale.clear();
return true;
}
void reset() {}
private:
bool update_one(const filter_param_set *params) {
filter_val *v = io_map[params];
bool changed = false;
if (!compute(params, v, changed)) {
return false;
}
if (changed) {
change_result(v);
}
return true;
}
typedef std::map<const filter_param_set*, filter_val*> io_map_t;
io_map_t io_map;
std::vector<const filter_param_set*> stale;
};
/*
User-defined filters should derive from this class so that they don't
have to work with filter_val* directly. Assumes that the filter only
returns one type of result.
*/
template <typename T>
class typed_map_filter : public map_filter {
public:
typed_map_filter(filter_input *input) : map_filter(input) {}
virtual ~typed_map_filter() {}
virtual bool compute(const filter_param_set *params, bool adding, T &res, bool &changed) = 0;
virtual void result_removed(const T &res) { }
private:
bool compute(const filter_param_set *params, filter_val *&res, bool &changed) {
bool success;
T val;
if (res != NULL) {
success = get_filter_val(res, val);
assert(success);
}
success = compute(params, res == NULL, val, changed);
if (!success) {
return false;
}
if (!res) {
res = new filter_val_c<T>(val);
} else {
success = set_filter_val(res, val);
assert(success);
}
return true;
}
void result_removed(const filter_val *res) {
T val;
bool success = get_filter_val(res, val);
assert(success);
result_removed(val);
}
};
...
#endif
我也手動檢查了複製ive包括並且沒有找到。這段代碼也可以在linux和Mac OS X上使用gcc編譯好（並且運行正常）;它也可以在Mac OS X上與clang編譯。Clang的靜態分析器也沒有發現任何東西。有任何想法嗎？
你可以嘗試'的typedef typed_map_filter typed_map_filter_float;'然後派生自' typed_map_filter_float'？ –
rodrigo
它仍然導致相同的錯誤。 – bluechill
同樣的錯誤？在同一行或'typedef'中？ – rodrigo