The == operator should not be used on C-Strings (char pointers), as the == operator compares their addresses and not the contiguous values. What you should use is std::string objects instead of char* and then the overloaded == operator will work just as required. You will also be able...
istream&operator>> (istream&is,char* str ); istream&operator>> (istream&is, signedchar* str ); istream&operator>> (istream&is, unsignedchar* str ) 当然也可以测试如下: if((cin >> a) == cin) { cout <<"Equal"<< endl;// Yes }else{ cout <<"Not Equal"<< endl; } 为什么可...
istream& operator>> (istream& is, signed char* str ); 1. istream& operator>> (istream& is, unsigned char* str ) 1. 当然也可以测试如下: if ((cin >> a) == cin) { 1. cout << "Equal" << endl; // Yes 1. } else { 1. cout << "Not Equal" << endl; 1. } 1. 为什...
除非特化,调用类型 T 上的operator!=。 特化标准库提供 std::not_equal_to 在不指定 T 时的特化,令形参类型和返回类型留待推导。 not_equal_to<void> (C++14) 实现x != y 的函数对象,推导形参类型和返回类型 (类模板特化) (C++14 起)
constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value; (C++17 起) 继承自 std::integral_constant 成员常量 value [静态] 如果R1::num != R2::num || R1::den != R2::den 那么是 true,否则是 false (公开静态成员常量) 成员函数 operator bool 将对象转换到 bool,返回 va...
(std::cmp_less(-1, 1U));static_assert(std::cmp_less_equal(-1, 1U));static_assert(!std::cmp_greater(-1, 1U));static_assert(!std::cmp_greater_equal(-1, 1U));static_assert(-1==0xFFFFFFFFU);//< warning: sign-unsign comparisonstatic_assert(std::cmp_not_equal(-1, 0xFFFFFFFFU...
}/*test operator!=()*/voidtestOptorNotEqual() {constCMoney money123FF(123,"FF");constCMoney money123USD(123,"USD");constCMoney money12FF(12,"FF");constCMoney money12USD(12,"USD");//checkCPPUNIT_ASSERT(!(money123FF !=money123FF)); ...
bool operator == (const iterator& rhs) const; returns true if the two underlying iterators are equal.bool operator != (const iterator& rhs) const; returns true if the two underlying iterators are not equal.iterator& operator ++ (); the prefix increment - moves the iterator to the next ...
The contained values are compared (using the corresponding operator of T) only if both lhs and rhs contain values. Otherwise, lhs is considered equal to rhs if, and only if, both lhs and rhs do not contain a value. lhs is considered less than rhs if, and only if, rhs contains a...
c++ bool Base::Equal(Base* other) = 0; bool Derived::Equal(Base* other) { Derived* that = dynamic_cast<Derived*>(other); if (that == NULL) return false; ... } 缺点: 在运行时判断类型通常意味着设计问题.如果你需要在运行期间确定一个对象的类型,这通常说明你需要考虑重新设计你的类. ...