std::string question

[Dylan]

How do I insert a NULL character into a std::string?

thanks

 

[Ioannis Vranos]

How do I insert a NULL character into a std::string?

thanks

It would be better if you told us exactly what do you want to do.






Regards,

Ioannis Vranos

 

[John Harrison]

How do I insert a NULL character into a std::string?

thanks

Exactly the same way as any other character, for instance.

std::string s = "abc";

std::cout << s.size(); // prints 3
s.insert(s.begin(), '\0'); // insert nul at beginning
std::cout << s.size(); // prints 4

john

 

[Sharad Kala]

How do I insert a NULL character into a std::string?

std::string s;
s.push_back('\0');

 

[Thomas Matthews]

How do I insert a NULL character into a std::string?

thanks

std::string example("Hello");
example += "\0";


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[Ali Cehreli]

std::string example("Hello");
example += "\0";

Unfortunately that won't work because the string literal "\0" would be
parsed as the empty string "".

This works:

example += '\0';

Ali

 

[Mike Wahler]

How do I insert a NULL character into a std::string?

The macro 'NULL' does not refer to a character value,
but to a pointer value.

The term 'NUL' is defined by the ASCII (and perhaps
others) character set as the value zero. The C++
language does not require use of a particular character
set (only that it contain a minimum set of values).
The term 'NUL' is not defined by standard C++ (but
the value zero is). The value zero is one of the
required values for character types.


#include <iostream>
#include <string>

int main()
{
std::string s("Hello world");

std::cout << "Before insert:\n\n";

std::cout << "string 's' has a length of "
<< s.size() << " characters.\n";

std::cout << "Output of std::cout << s :\n"
<< s << '\n';

std::cout.put('\n');

s.insert(5, 1, 0); /* insert one character with value zero
before position 5 */

std::cout << "After insert:\n\n";

std::cout << "string 's' has a length of "
<< s.size() << " characters.\n";

std::cout << "Output of std::cout << s :\n"
<< s << '\n';

return 0;
}

-Mike

 

[David Harmon]

On Wed, 23 Jun 2004 18:03:10 GMT in comp.lang.c++, "Mike Wahler"

The macro 'NULL' does not refer to a character value,
but to a pointer value.

Sorry, but that's a dangerous misstatement. In C++, NULL must be
defined as a null pointer constant, which makes it an integral value not
a pointer value. So, given e.g.

int f(int);
int f(void *);
f(NULL);

The first f(int) is always called, and not the second f(void *).
This can be a surprise.