Return a Pointer to a Dynamically Allocated Array in C++ Return a Pointer to a Static Array (Not Recommended) Pass an Array as a Parameter to Modify It Use std::array or std::vector for Flexibility Conclusion Returning a pointer to an array from a function in C++ is a powerful ...
main.cpp: In member function 'virtual std::vector<int>& Base::fun()':main.cpp:9:16: warning: reference to local variable 'unused' returned [-Wreturn-local-addr]9 | return unused;| ^~~~main.cpp:8:26: note: declared here8 | std::vector<int> unused;| ^~~~ 问一问自己,这里是否...
最后试着用上面的配置器(allocator、constructor和uninitialized)写一个简单的vector容器: /*vector.h*/#include<memory>#include"my_alloc.h"#include"my_construct.h"template<classT,classAlloc=alloc>classvector {public: typedef T value_type; typedef T*pointer; typedef T*iterator; typedef T&reference; t...
On the other hand, if you have a pointer auto will automatically pick up pointerness: int* foo(); auto p_bar = foo(); // int* But you can also (thankfully) be explicit about it, and indicate that the variable is a pointer: int* foo(); auto *p_baz = foo(); // int* You ...
2.2 Vector 类 2.3 CopyOnWriteArrayList 类 2.4 ImmutableList 类 三、 AbstractSequentialList 抽象类子类 3.1 LinkedList 类 四、ArrayList 类 4.1 变量 4.2 方法 4.2.1 初始化(3个) 3.2.2 get 与 set 方法 4.2.3 add 方法 4.2.4 ensureCapacityInternal 方法 4.2.5 calculateCapacity 方法 4.2.6 ensureExplic...
To return a pointer you'd do: 1 2 3 4 5 6 7 8 9 10 11 12 book *findBookByAuthorName(string name) {for(intj = 0; j < i; j++) {if(name.compare(myBooks[j].getAuthor()) == 0) {returnmyBooks+j; } }returnnullptr;} } ...
The following return values for LEADTOOLS functions are possible. These are the values in the lterr.h (C API), or L_ERROR.
int vector[20]; } struct mystruct foo() { struct mystruct bar; ...do something nifty with bar... return bar; } P.S. The C language does not let you return an array unless you either (a) just return a pointer to the type of whatever the array is, and you have to allocate th...
And it also works with C++11, you just have to do it without std::make_unique<T>(). The std::unique_ptr<T> documentation contains: The std::unique_ptr is a smart pointer that owns and manages another object through a pointer and disposes of that object when the unique_ptr goes out...
Example of return value 3 – user type result by pointer Example of return value 4 – user type result by value See Also A scalar return value that can fit into 64 bits is returned through RAX—this includes __m64 types. Non-scalar types including floats, doubles, and vector types such...