C++规定枚举的大小只要能够容纳下3bits或者4bits(上面的例子)就行,至于分配1byte还是4bytes,是编译器决定的,但是C++标准有个限制:1<=sizeof(enum)<=sizeof(int)。 实例代码: #include<iostream> usingnamespacestd; classA{ public: //enum类型本身不占内存 enumEnumTest{ a=1,b=5}; }; enumEnumTest{ ...
当然可以加点其它,比起C要好一丢丢,然而也仅限于此。以至于当这种简单类型无法满足我们需要要扩展的时候就会使用class/struct来取代写出类似这种代码 1 2 3 4 5 6 7 8 9 10 11 12 13 14 publicsealedclassError { publicstaticreadonlySignError=newError(110,"sign error."); publicstaticreadonlyNetworkError...
JVM持有的每个Class实例都指向一个数据类型(class或interface)。一个Class实例包含了该class的所有完整信息,包括类名、包名、父类、实现的接口、所有方法、字段等,因此,如果获取了某个Class实例,我们就可以通过这个Class实例获取到该实例对应的class的所有信息。这种通过Class实例获取class信息的方法就称为反射(Reflection)...
std::error(std::format("Unexpected tag {}, expected {} instead", tag, Tag::Blob)); } le u32 size; // NOTE: Blob content uses complex aligmnent rules that // seemingly make sense to align the content on a 4-byte boundary // but in reality make utterly no because it does not ...
std::scanf( "%d", &val ); 上面的两种情况看是基本上属于同一种类型的问题,其实不然。第一种情况会导致 编译时错误,会因为std::cin没有定义对应的枚举类型的重载>>运算符而出错,这 就说明枚举类型是一种独立和鉴别的类型;而第二种情况不会有任何编译时问题, 但是可能会导致scanf函数栈被破坏而使得程序运行...
enumclassendian{little =0, big =1, native = little }; Members ElementDescription littleIndicates that scalar types are little-endian. That is, the least significant byte is stored in the smallest address. For example,0x1234is stored0x340x12. ...
This will declare a 1 byte enumeration. Saturday, September 2, 2006 1:58 PM ✅Answered To be portable, you could always wrap the enum in a way such as this 複製 #include <iostream> using namespace std; enum MyEnum { zero, one, two, three }; class MyTinyEnum { unsigned char va...
C++规定枚举的大小只要能够容纳下3bits或者4bits(上面的例子)就行,至于分配1byte还是4bytes,是编译器决定的,但是C++标准有个限制:1<=sizeof(enum)<=sizeof(int)。 实例代码: #include <iostream> using namespace std; class A{ public: //enum类型本身不占内存 ...
成员函数：接下以test类进行函数讲解 test.h #pragma once #include #include <QFlags> class XTest : public QObject { Q_OBJECT Q_CLASSINFO("author", "Sabrina Schweinsteiger")Q_PROPERTY(bool autoStartup READ autoStartup WRITE setAutoStartup NOTIFY sigAutoStartup)public:XTest(QObject* p = nullptr) ...
int run(int interlaced, void **dst, const void **src, int width, int src_y_pitch_byte, int src_uv_pitch_byte, int dst_y_pitch_byte, int height, int dst_height, int *crop); @@ -133,10 +133,10 @@ class RGYConvertCSP { class RGYInputPrm { public: int threadCsp; uint32_t...