Eroare de compilare: user.cpp: In function ‘bool f1(punctX, punctX)’: user.cpp:20:23: error: call of overloaded ‘abs(double)’ is ambiguous if(abs(A.x-B.x) < 0.00000001) return A.y - B.y > 0; ^ user.cpp:20:23: note: candidates are: In file included from /usr/local/include/c++/4.8.0/cstdlib:72:0, from /usr/local/include/c++/4.8.0/bits/stl_algo.h:59, from /usr/local/include/c++/4.8.0/algorithm:62, from user.cpp:2: /usr/include/stdlib.h:766:12: note: int abs(int) extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur; ^ user.cpp:12:10: note: bool abs(double) bool abs(double x) ^ In file included from /usr/local/include/c++/4.8.0/random:38:0, from /usr/local/include/c++/4.8.0/bits/stl_algo.h:65, from /usr/local/include/c++/4.8.0/algorithm:62, from user.cpp:2: /usr/local/include/c++/4.8.0/cmath:91:3: note: constexpr long double std::abs(long double) abs(long double __x) ^ /usr/local/include/c++/4.8.0/cmath:87:3: note: constexpr float std::abs(float) abs(float __x) ^ /usr/local/include/c++/4.8.0/cmath:81:3: note: constexpr double std::abs(double) abs(double __x) ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_algo.h:59:0, from /usr/local/include/c++/4.8.0/algorithm:62, from user.cpp:2: /usr/local/include/c++/4.8.0/cstdlib:174:3: note: long long int std::abs(long long int) abs(long long __x) { return __builtin_llabs (__x); } ^ /usr/local/include/c++/4.8.0/cstdlib:166:3: note: long int std::abs(long int) abs(long __i) { return __builtin_labs(__i); } ^ user.cpp: In function ‘bool f2(punctX, punctX)’: user.cpp:25:23: error: call of overloaded ‘abs(double)’ is ambiguous if(abs(A.x-B.x) < 0.00000001)return A.y - B.y < 0; ^ user.cpp:25:23: note: candidates are: In file included from /usr/local/include/c++/4.8.0/cstdlib:72:0, from /usr/local/include/c++/4.8.0/bits/stl_algo.h:59, from /usr/local/include/c++/4.8.0/algorithm:62, from user.cpp:2: /usr/include/stdlib.h:766:12: note: int abs(int) extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur; ^ user.cpp:12:10: note: bool abs(double)