Parsing strings

**Shingetsu Kurai** · 07-10-2011

Hey all. I would like to find a way to parse a string, without using vectors.
Basically let us say I have...

Code:

std::string str = "value1|value2|value3"

and I want to parse or tokenize it so that i have:

Code:

string values[100];
//resulting strings
values[0] = "value1";
values[1] = "value2";
values[2] = "value3";

I would really like to do it without using vectors or boost. But if it is necessary I guess I could.
Up until now, ive been using istringstream to parse it through whitespace, but I want to be able to use custom seperators (like |).

**laserlight** · 07-10-2011

For your example using std::getline with '|' as the delimiter in a loop should suffice.

**manasij7479** · 07-10-2011

Up until now, ive been using istringstream to parse it through whitespace, but I want to be able to use custom seperators

Use istringstream , but when getting the value from the stream use getline with the necessary delimiter .

EDIT: Saw Laserlight's post after writhig this

**Shingetsu Kurai** · 07-10-2011

Yeah, I've made a little test code with it and it works fine =D thanks. Here is the code:

Code:

#include <iostream>
#include <string>
#include <sstream>

#define ARRAY_SIZE 100

using namespace std;

int main()
{
    string tokens[ARRAY_SIZE], source("Here|is|some|text");
    istringstream iss(source);
    int i=0;
    while(getline(iss, tokens[i], '|'))
    {
        cout << tokens[i] << endl;
        i++;
    }
    return 0;
}

I wasnt entirely sure that the statement inside while was actually run, thought it only evaluated as an anonymous bool variable. ty all

**laserlight** · 07-10-2011

Remember to check that i < ARRAY_SIZE before calling getline.

**Elysia** · 07-10-2011

Originally Posted by Shingetsu Kurai

Hey all. I would like to find a way to parse a string, without using vectors.
...
I would really like to do it without using vectors or boost. But if it is necessary I guess I could.

Now why would you do that? That is counter-productive.

**Shingetsu Kurai** · 07-11-2011

Well, I dont want to use boost because it is an additional library to include, which in my opinion is unnecessary if it can be done easily without it. (Dont want to add unneded weight to the program)
And I prefer string arrays to vectors because I can manage them more easily.

**laserlight** · 07-11-2011

Originally Posted by Shingetsu Kurai

And I prefer string arrays to vectors because I can manage them more easily.

If you would learn how to use vectors, you would manage them just as easily.

**Elysia** · 07-11-2011

Originally Posted by Shingetsu Kurai

Well, I dont want to use boost because it is an additional library to include, which in my opinion is unnecessary if it can be done easily without it. (Dont want to add unneded weight to the program)
And I prefer string arrays to vectors because I can manage them more easily.

Boost can do it even more conveniently. You should not avoid boost because "it is just another library." It's not. It is a C++ programmer's best friend after the standard library.

**whiteflags** · 07-11-2011

Originally Posted by Elysia

Boost can do it even more conveniently. You should not avoid boost because "it is just another library." It's not. It is a C++ programmer's best friend after the standard library.

Except it IS a library. Boost can also do their own marketing.

**Elysia** · 07-11-2011

I didn't mean that it isn't a library. Sure, it is.
I meant it isn't "just another library." It is the library.

**laserlight** · 07-11-2011

Originally Posted by Elysia

I meant it isn't "just another library." It is the library.

As much as I am a fan of Boost, that is not true. Objectively, it is just another library (or collection of libraries) since it is not part of the standard library or technical report extensions thereof, even if various Boost libraries have made their way through the standardisation process, and the whole project was intended to help move the standard library forward.

**Elysia** · 07-11-2011

I realize this is subjective. What I mean to say is that when I say the library, I simply means it's a highly recommended library in my opinion.

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