Questions tagged [pass-by-const-reference]
52 questions
0
votes
2 answers
Should compiler warn about unsafe behaviour when using temporary object on const ref type parameters?
Let's consider following improper code:
#include
#include
struct C {
C(const std::string &_s): s(_s) { }
void run() {
std::cout << "Here we are using the string " << s << "\n";
}
const std::string &s;
};
int…
ArturFH
- 1,697
- 15
- 28
0
votes
3 answers
Argument passed by value or const reference in the constructor
Which constructor is better for the following class?
struct Foo
{
Foo(const int& val):val_(val){} // constructor 1
Foo(int val):val_(val){} // constructor 2
int val_;
};
Without any compiler optimization, do they copy val only once or…
Marco Agnese
- 349
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- 15
0
votes
2 answers
Passing a struct of dynamic arrays by const reference
If I have a struct in C++ containing dynamically allocated arrays, for example:
typedef struct foo {
int* p;
} foo;
foo aFoo;
aFoo.p = new int[n];
for(int i = 0; i < n; ++i)
aFoo.p[i] = 0;
How can I pass it by reference to a function so that…
0
votes
1 answer
Understanding call by value-result and call by reference differnce
So I have this piece of Pascal code:
program P;
var a: array [1..2] of Integer;
var i :Integer;
var k :Integer;
procedure update(x,y,z: Integer);
begin
x := x+1;
y := x*2;
x := y;
k := x;
end
begin
…
wannabe programmer
- 653
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0
votes
2 answers
C++ pass-by-non-const-reference method inside pass-by-const-reference method
I have this function pass_by_const(const std::string& s) which wants to call pass_by_non_const(std::string& s).
If I have this method's definition
pass_by_const(const std::string& s)
{
pass_by_non_const(s);
}
would compiler yield at me, and…
kiriloff
- 25,609
- 37
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0
votes
2 answers
Transmit parameter by value or by reference in C++?
Possible Duplicate:
Pass by reference more expensive than pass by value
I want to know which is better, sending parameters by value or by reference in C++. I heard that there are cases where sending by value is faster than sending by reference.…
Jacob Krieg
- 2,834
- 15
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- 140
-1
votes
2 answers
Is there any realistic use case for passing pointers by constant reference rather than by value?
Since a reference (some-type&) behaves as a constant pointer (some-type * const), passing an argument via a "constant reference to pointer" parameter (some-type * const&) seems a bit redundant, because
if the parameter is some-type *
I'm copying…
Enlico
- 23,259
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