19行我們overload了<< operator,由於也是global function,所以也要宣告friend。 最後49行和55行的user code,直接用+和*就可以計算複數,而且cout也直接支援Complex物件,非常清楚,這就是operator overloading的威力,不過,在class implementation時,operator overloading的語法不是很好寫,雖然語法很有邏輯很有道理,但就是太臭太長了,還真的得時間熟悉才行。
1)For operator overloading to work, at least one of the operandsmust be a user defined class object. 2)Assignment Operator:Compiler automatically creates a default assignment operator with every class. The default assignment operator does assign all members of right side to the left side and wo...
Operator overloading is another feature I could have used but didn’t. Whenever the compiler sees such an operator, it simply replaces it with the appropriate function call. So in the code listing that follows, the last two lines are equivalent and the performance penalty is easily understood...
// overload_date.cpp// compile with: /EHsc#include<iostream>usingnamespacestd;classDate{intmo, da, yr;public: Date(intm,intd,inty) { mo = m; da = d; yr = y; }friendostream&operator<<(ostream& os,constDate& dt); }; ostream&operator<<(ostream& os,constDate& dt) { os << ...
Compiler error C3365operator 'operator': differing operands of type 'type' and 'type' Compiler error C3366'member': static data members of managed/WinRT types must be defined within the class definition Compiler error C3367'function': cannot use static function to create an unbound delegate ...
Compiler warning (level 1) C4454 'function' is overloaded by more than the number of input parameters without having [DefaultOverload] specified. Picking 'declaration' as the default overload Compiler warning (level 1) C4455 'operator operator': literal suffix identifiers that do not st...
Overloaded operator new and operator delete Previous versions of the compiler allowed non-member operator new and non-member operator delete to be declared static, and to be declared in namespaces other than the global namespace. This old behavior created a risk that the program would not call ...
断言,是宏,而非函数。assert 宏的原型定义在<assert.h>(C)、<cassert>(C++)中,其作用是如果它的条件返回错误,则终止程序执行。可以通过定义NDEBUG来关闭 assert,但是需要在源代码的开头,include <assert.h>之前。 使用 代码语言:javascript 代码运行次数:0 ...
Compiler error C2276'operator': illegal operation on bound member function expression Compiler error C2277'function': cannot take address of this member function Compiler error C2278'token': unexpected token. Format is '__has_cpp_attribute( identifier )' ...
function overloading:函数重载 overload resolution:重载解析/重载决议 Implicit Conversion:隐式类型转换 number of argument:参数数目 defensive programming:预防/防御性编程 exception:异常 regular:正规 motivation:动机 throw:异常 catch:捕获 qualification:修饰符 ...