通过ref传递vs传递指针 [英] pass by ref vs pass by pointer
问题描述
大家好，
区别b / w通过ref传递并通过C ++中的指针传递
你将对象传递为args ..
干杯..
HI all,
Whats the difference b/w pass by ref and pass by pointer in C++ when
ur passing objects as args..
Cheers..
推荐答案
Radde写道：
什么是差异b / w通过ref传递并通过C ++中的指针传递
你将对象作为args传递..
Whats the difference b/w pass by ref and pass by pointer in C++ when
ur passing objects as args..
引用始终引用有效对象，根据语言规则。
不同的是，当在函数内部时，如果参数是ref，
你可以依赖它是一个真实的对象。如果它是指针，它可以使
无效值或为空。
V
A reference always refers to a valid object, according to language rules.
The difference is that when inside a function, if the argument is a ref,
you can rely upon it being a real object. If it''s a pointer, it can have
an invalid value or be null.
V
Victor Bazarov写道：
Victor Bazarov wrote:
Radde写道：
Radde wrote:
在C ++中传递引用和传递指针之间有什么区别？
当您将对象作为参数传递时。
根据语言规则，引用始终引用有效对象。
不同之处在于，当在函数内部时，如果参数是引用，
你可以信赖它是一个真实的物体。
What''s the difference between pass by reference and pass by pointer in C++
when you are passing objects as arguments.
A reference always refers to a valid object, according to language rules.
The difference is that, when inside a function, if the argument is a reference,
you can rely upon it being a real object.
cat main.cc
#include< iostream>
void f（const int& r）{
std :: cout<< r = << r<< std :: endl;
}
int main（int argc，char * argv []）{
int * p = 0;
int& r = * p;
f（r）;
返回0;
}
g ++ -Wall -ansi -pedantic -o main main.cc
。/ main
分段错误（核心转储）
如果它是指针，它可能有一个无效值或者为空。
cat main.cc
#include <iostream>
void f(const int& r) {
std::cout << "r = " << r << std::endl;
}
int main(int argc, char* argv[]) {
int* p = 0;
int& r = *p;
f(r);
return 0;
}
g++ -Wall -ansi -pedantic -o main main.cc
./main
Segmentation fault (core dumped)
If it''s a pointer, it can have an invalid value or be null.
E. Robert Tisdale写道：
E. Robert Tisdale wrote:
Victor Bazarov写道：
Victor Bazarov wrote:
Radde写道：
Radde wrote:
有什么区别？当您将对象作为参数传递时，通过引用传递并通过指针传递
。
What''s the difference between pass by reference and pass by pointer
in C++
when you are passing objects as arguments.
根据语言规则，引用始终引用有效对象。
不同之处在于，当在函数内部时，如果参数是
引用，那么你可以依赖它作为一个真实的对象。
A reference always refers to a valid object, according to language rules.
The difference is that, when inside a function, if the argument is a
reference,
you can rely upon it being a real object.
[。 ..example调用未定义的行为已删除...]
[...example invoking undefined behaviour removed...]
我们正在讨论具有已定义行为的有效程序。
We''re are talking valid programs with defined behaviour here.
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