std::string and memory

[l2u]

How do I do memcpy with std::string?
I tried:

std::string test;
test.append();

But it doesnt work..

I want to do something like:

char h[4];
size_t size = 12;
memcpy(&h, &size, 4 );

[anon]

Append reference

Basically append takes parameters to know what to append.

[l2u]

Append reference

Basically append takes parameters to know what to append.

I did:
string.append(&h, 0, 4);

[7stud]

You need to use pointers to the first and last element of the range. The name of an array acts like a pointer to the first element of an array, so 'h' is a pointer. On the other hand, something like h[3] is a character. However, you can use pointer arithmetic to get a pointer to h[3].

char h[] = "cruel world";

string str = "hello";
str.append(h+4, h+10);
cout<<str<<endl;

Or, if you want to append the whole char array, you can simply do this:

char h[] = "cruel world";

string str = "hello ";
str.append(h, 12);
cout<<str<<endl;