type prob

[Josephine Schafer]

hi

another simple problem sorry. i've got a string, "Buffer", and an int, Loop.
Somehow, this:

Buffer.length<=Loop+1

gives this:

error C2296: '<=' : illegal, left operand has type 'unsigned int (__thiscall
std::basic_string<char,struct std::char_traits<char>,class std::allocato
r<char> >::*'

Buffer.length should return an int, correct? loop is certainly an int. what
am i doing wrong?

No.
Buffer.length returns std::string::size_type and not int.

Try this -
#include <string>
int main()
{
std::string Buffer("abc");
std::string::size_type loop = Buffer.length ();
}

HTH,
J.Schafer

 

[Victor Bazarov]

another simple problem sorry. i've got a string, "Buffer", and an int, Loop.
Somehow, this:

Buffer.length<=Loop+1

Did you mean to say

Buffer.length()<=Loop+1

gives this:

error C2296: '<=' : illegal, left operand has type 'unsigned int (__thiscall
std::basic_string<char,struct std::char_traits<char>,class std::allocato
r<char> >::*'

Buffer.length should return an int, correct? loop is certainly an int. what
am i doing wrong?

You're not calling the function, you're placing its name in the
expression. That's what the compiler is telling you: "Left operand
has type '...<function declaration>...' "

Victor

 

[Wouter Lievens]

hi

another simple problem sorry. i've got a string, "Buffer", and an int, Loop.
Somehow, this:

Buffer.length<=Loop+1

gives this:

error C2296: '<=' : illegal, left operand has type 'unsigned int (__thiscall
std::basic_string<char,struct std::char_traits<char>,class std::allocato
r<char> >::*'

Buffer.length should return an int, correct? loop is certainly an int. what
am i doing wrong?

cheers
dave

Though compile errors seem cryptic, they mostly speak the truth.

Left operand in this case has a function's type: that's becasue you're not
calling it!

 

[Rolf Magnus]

sorry i think i'm missing something everone else is seeing. how do i
find the length of the string "Buffer", as an "int" data type?

You got the answer already. You must _call_ the function to get its
result. You're comparing the function itself to Loop+1, not the result
of a call to it. Buffer.length gives you the function. Buffer.length()
calls the function and gives you the result.

 

[Victor Bazarov]

You got the answer already. You must _call_ the function to get its
result. You're comparing the function itself to Loop+1, not the result
of a call to it. Buffer.length gives you the function. Buffer.length()
calls the function and gives you the result.

Thanks, Rolf.

Now, for the inattentive ones: it's the parentheses.

 

[Dave]

hi

another simple problem sorry. i've got a string, "Buffer", and an int, Loop.
Somehow, this:

Buffer.length<=Loop+1

gives this:

error C2296: '<=' : illegal, left operand has type 'unsigned int (__thiscall
std::basic_string<char,struct std::char_traits<char>,class std::allocato
r<char> >::*'

Buffer.length should return an int, correct? loop is certainly an int. what
am i doing wrong?

cheers
dave

 

[Dave]

sorry i think i'm missing something everone else is seeing. how do i find
the length of the string "Buffer", as an "int" data type?

 

[Dave]

Ahahaha yes i am feeling stupid. Looks like its back to basics for me:

10 PRINT "HELLO WORLD"
20 GOTO 10

cheers
dave