输出: C:\Users\Windows\CLionProjects\Project1\main.cpp: In function 'int main()': C:\Users\Windows\CLionProjects\Project1\main.cpp:10:22: error: passing 'const Time' as 'this' argument discards qualifiers [-fpermissive] t1.set_time(2,2,2); ^ In file included from C:\Users\Windows\...
编译结果: root@txp-virtual-machine:/home/txp/c++# g++ test.cpp test.cpp: In function ‘void g()’: test.cpp:11:25: error: ‘b’ was not declared in this scope printf("b = %d\n", b); 1. 2. 3. 4. 在g()函数里面找不到变量b,没有定义,这证明了上面所说的观点。 四、总结: ...
const.cpp: In member function ‘int WY::get() const’: const.cpp:36:15: error: no matching function for call to ‘Int::Int(const int&)’ const.cpp:36:15: note: candidates are: const.cpp:13:3: note: Int::Int() const.cpp:13:3: note: candidate expects 0 arguments, 1 provided...
头文件定义 /** FunctionConst.h*/#ifndef FUNCTIONCONST_H_#defineFUNCTIONCONST_H_classFunctionConst {public:intvalue; FunctionConst();virtual~FunctionConst();const int getValue(); int getValue2() const;};#endif/* FUNCTIONCONST_H_ */ 源文件实现 /** FunctionConst.cpp*/#include"FunctionConst....
代码语言:cpp 代码运行次数:0 运行 AI代码解释 inline\_LIBCPP\_HIDE\_FROM\_ABI \_LIBCPP\_CONSTEXPR\_CXX23floatfmax(float\_\_x,float\_\_y)\_NOEXCEPT{ifconsteval{return\_\_builtin\_fmax(\_\_x,\_\_y);}else{return::fmaxf(\_\_x,\_\_y);}} ...
// constant_member_function.cppclassDate{public: Date(intmn,intdy,intyr );intgetMonth()const;// A read-only functionvoidsetMonth(intmn );// A write function; can't be constprivate:intmonth; };intDate::getMonth()const{returnmonth;// Doesn't modify anything}voidDate::setMonth(intmn )...
对于第三个问题,则是添加了一个 magic function 即 std::construct_at,它的作用是在指定的内存位置上调用对象的构造函数,用来在常量求值中取代placement new。这样的话我们就可以先通过std::allocator分配内存,再通过std::construct_at来构造对象了。该提案最终被接受,进入了 C++20,同时使得std::vector,std::string...
2) static function。你可以把一个函数标记为static（也称为internal linkage），这样该函数的symbol就会...
Flag a member function that is not marked const, but that does not perform a non-const operation on any member variable. 如果一个函数没有定义为const类型,有没有执行针对任何成员变量的非常量操作,标记它。 原文链接 https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#con2...
这里我直接贴出cppreference中的示例代码: #include <iostream> #include <stdexcept> // C++11 constexprfunctionsuse recursion rather than iteration // (C++14 constexprfunctionsmay uselocalvariables and loops) constexpr int factorial(int n) {returnn <= 1 ? 1 : (n factorial(n - 1)); } ...