我正在尝试编译其他人的c ++代码来进行MAFIA集群。我的C ++经验有限。使用Makefile时遇到问题。
传递给binary_function的参数数量似乎是一个问题，但在我看来，正在传递3个参数（并且应该有3个参数）。括号和括号的数量也看起来正确。在这种情况下使用ref <>有什么特别的地方吗？我不太确定为什么将3个参数视为一个参数。
#ifndef MAFIA_CDU_H_
#define MAFIA_CDU_H_
/** @file cdu.h a single (candidate) dense unit in MAFIA algorithm */
#include <functional>
#include <vector>
#include "ref.h"
#include "window.h"
using namespace std;
/** a coordinate of a single window for a single dimension */
struct dimpair_t
{
dimpair_t(int dim, int win)
{
this->dim = dim;
this->win = win;
}
bool operator==(const dimpair_t &dp2) const
{
return dim == dp2.dim && win == dp2.win;
}
bool operator!=(const dimpair_t &dp2) const
{
return !(*this == dp2);
}
/** the dimension number */
int dim;
/** the number of window inside a dimension */
int win;
};
/** a single (candidate) dense unit */
class Cdu : public ref_object
{
/** creates an empty CDU */
Cdu() : npoints(0), flag(false) {}
public:
/** creates a 1D CDU */
Cdu(int dim, int win) : npoints(0), flag(false)
{
coords.push_back(dimpair_t(dim, win));
}
/** the dimensionality (length) of the CDU */
inline int len() const { return coords.size(); }
/** checks whether the CDU is the same as another one */
bool operator==(const Cdu &cdu2) const;
/** checks whether the CDU is distinct from another one */
bool operator!=(const Cdu &cdu2) const { return !(*this == cdu2); }
/** checks whether this CDU is 'less' than the other one. The less comparison
is somewhat artificial, but ensures strict order on the set of all
possible CDUs.
CDU a is less than CDU b iff one of the following holds:
- dimensionality of a is less than dimensionality of b
- a and b are of the same dimensionality, but the vector of dimension
numbers for a is lexicographically smaller than the vector of dimension
numbers for b
- a and b are of the same dimensionality, and their dimension number
vectors are equal, but the corresponding window number vector for a is smaller
*/
bool operator<(const Cdu &cdu2) const;
/** gets the subsequence of the CDU by omitting one of the components
@param ic the component to omit
@remarks the caller is responsible for deallocation of the returned value
*/
Cdu *subsequence(int ic) const;
/** checks whether the CDU can merge with another one */
bool can_merge_with(const Cdu &cdu2);
/** merge two units and create a third one; the new CDU is
allocated in dynamic memory and is owned by the caller */
Cdu *merge_with(const Cdu &cdu2);
/** checks whether this unit is assimilated into another one, i.e. its set of
coordinates is a subset of cdu2's set of coordinates */
bool is_assimilated_into(const Cdu &cdu2) const;
/** checks whether the CDU contains the point */
template <class T>
bool contains_point(const T *ps, int n, int d, int i, const vector<Window> &ws) const;
/** counts the points inside the CDU (the naive way), also sets the point count */
template <class T>
int count_points_direct(const T *ps, int n, int d, const vector<Window> &ws);
/** conts the points inside the CDU using bitmaps from windows, and also sets
the point count */
int count_points_bitmaps(int nwords, unsigned *bmps, const vector<Window> &ws);
/** checks whether CDU is dense with respect to window thresholds */
bool is_dense(const vector<Window> &ws) const;
/** checks whether this DU shares a face with another one;
@notes it returns false if two DUs are the same
*/
bool has_common_face_with(const Cdu &cdu2, const vector<Window> &ws) const;
/** the coordinates of the dense unit, sorted by ascending dimension
number */
vector<dimpair_t> coords;
/** number of points in the CDU */
int npoints;
/** the flag which is used for various purposes connected with CDUs; in
particular, it can mark it as joined or already visited */
bool flag;
};
/** the comparator for ref<Cdu>, so that we can put it into a set */
struct CduCmp : binary_function<ref<Cdu>, ref<Cdu>, bool>
{
inline bool operator()(const ref(Cdu) & p, const ref(Cdu) & q) const
{
// TODO: handle the 0-pointer in some way
return *p < *q;
} // operator()
}; // CduCmp
#endif
这是我看到的错误。
In file included from src/cdu.cpp:7:0:
src/cdu.h:105:57: error: wrong number of template arguments (1, should be 3)
struct CduCmp : binary_function<ref<Cdu>, ref<Cdu>, bool>
^
In file included from /usr/include/c++/7/functional:49:0,
from src/cdu.h:6,
from src/cdu.cpp:7:
/usr/include/c++/7/bits/stl_function.h:118:12: note: provided for ‘template<clas s _Arg1, class _Arg2, class _Result> struct std::binary_function’
struct binary_function
^~~~~~~~~~~~~~~
In file included from src/cdu.cpp:7:0:
src/cdu.h:107:43: error: ISO C++ forbids declaration of ‘ref’ with no type [-fpe rmissive]
inline bool operator()(const ref(Cdu) & p, const ref(Cdu) & q) const
^
src/cdu.h:107:45: error: expected ‘,’ or ‘...’ before ‘p’
inline bool operator()(const ref(Cdu) & p, const ref(Cdu) & q) const
^
src/cdu.h: In member function ‘bool CduCmp::operator()(const int (*)(Cdu)) cons ’:
src/cdu.h:110:17: error: ‘p’ was not declared in this scope
return *p < *q;
^
src/cdu.h:110:22: error: ‘q’ was not declared in this scope
return *p < *q;
^
In file included from src/mafia-solver.cpp:1:0:
src/cdu.h:105:57: error: wrong number of template arguments (1, should be 3)
struct CduCmp : binary_function<ref<Cdu>, ref<Cdu>, bool>
^
In file included from /usr/include/c++/7/functional:49:0,
from src/cdu.h:6,
from src/mafia-solver.cpp:1:
/usr/include/c++/7/bits/stl_function.h:118:12: note: provided for ‘template<clas s _Arg1, class _Arg2, class _Result> struct std::binary_function’
struct binary_function
^~~~~~~~~~~~~~~
In file included from src/mafia-solver.cpp:1:0:
src/cdu.h:107:43: error: ISO C++ forbids declaration of ‘ref’ with no type [-fpe rmissive]
inline bool operator()(const ref(Cdu) & p, const ref(Cdu) & q) const
^
src/cdu.h:107:45: error: expected ‘,’ or ‘...’ before ‘p’
inline bool operator()(const ref(Cdu) & p, const ref(Cdu) & q) const
^
src/cdu.h: In member function ‘bool CduCmp::operator()(const int (*)(Cdu)) cons ’:
src/cdu.h:110:17: error: ‘p’ was not declared in this scope
return *p < *q;
^
src/cdu.h:110:22: error: ‘q’ was not declared in this scope
return *p < *q;
^
答案 0 :(得分：1)
在这里的此功能中，使用ref(Cdu)的语法错误。使用尖括号而不是括号。
inline bool operator()(const ref(Cdu) & p, const ref(Cdu) & q) const
{
// TODO: handle the 0-pointer in some way
return *p < *q;
} // operator()
更正的版本：
inline bool operator()(const ref<Cdu> & p, const ref<Cdu> & q) const
{
// TODO: handle the 0-pointer in some way
return *p < *q;
} // operator()