我有以下代码
#include <iostream>
using namespace std;
class Point2D
{
public:
double x;
double y;
Point2D(double x_i,
double y_i):
x(x_i), y(y_i) {}
};
Point2D operator+(const Point2D& p1,
const Point2D& p2)
{
return Point2D(p1.x+p2.x, p1.y+p2.y);
}
Point2D operator*(double s, const Point2D& p)
{
return Point2D(p.x*s,p.y*s);
}
ostream& operator<<(ostream& os, const Point2D& p)
{
os << p.x << " " << p.y << endl;
return os;
}
int main(void)
{
const Point2D p1(2,3);
const Point2D p2(5,4);
cout << 0.5*(p1+p2) << endl;
return 0;
}
我可以编译它并获得正确的结果,但是当我尝试调试它时遇到了麻烦。显然,编译器可以弄清楚如何进行二进制操作,但调试器不能。我的编译器版本是 g++ (Ubuntu 4.9.1-16ubuntu6) 4.9.1。
$ g++ -g ./for_stack_overflow.cpp && gdb ./a.out
GNU gdb (Ubuntu 7.8-1ubuntu4) 7.8.0.20141001-cvs
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
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Reading symbols from ./a.out...done.
(gdb) break 41
Breakpoint 1 at 0x400b90: file ./for_stack_overflow.cpp, line 41.
(gdb) r
Starting program: /home/almog/Documents/a.out
3.5 3.5
Breakpoint 1, main () at ./for_stack_overflow.cpp:41
41 return 0;
(gdb) print 0.5*(p1+p2)
Can't do that binary op on that type
(gdb)
我做错了什么还是调试器有问题?
最佳答案
p1+p2 相当于调用了重载的 operator+ 方法,但是这个运算符到方法的边界是在编译时完成的。因此 gdb 不知道调用哪个方法。
关于c++ - gdb 不会执行二进制操作,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26970617/