Vectors in Arrays

Is there any way to pass a vector in the creation in an array besides creating a vector outside of the array and then passing the variable? Sorta like...

Code:

---

std::vector<std::string> array[] = {
    <create a vector here>,
    <create a vector here>,
    <create a vector here>,
    <etc...>
};

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Is anything like that possible, or am I gonna have to do it the hard way?

>Is anything like that possible, or am I gonna have to do it the hard way?
You'll probably have to do it the hard way unless you want to use Boost to initialize the vector or one of the standard constructors does what you want. For example:

Code:

---

#include <cstddef>
#include <iostream>
#include <string>
#include <vector>

int main()
{
        std::string init[] = {
                "This","is","a","test"
        };
        std::vector<std::string> array[] = {
                std::vector<std::string> ( 5, "test" ),
                std::vector<std::string> ( init, init + 4 )
        };

        for ( int i = 0; i < 2; i++ ) {
                for ( std::size_t j = 0; j < array[i].size(); j++ )
                        std::cout<< array[i][j] <<' ';
                std::cout<<'\n';
        }
}

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[edit]
Oh. my. god. Does this board really use a tab size of 8?
[/edit]

Quote:

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Originally Posted by Prelude

[edit]
Oh. my. god. Does this board really use a tab size of 8?
[/edit]

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Yep. First time? :)

On another note, you can do a vector of vectors:

Code:

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std::vector< std::vector<std::string> > v;

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Or you can use boost's multi-array, though I dunno how it works.
There's no need to do things the hard way...

Argh, forget it then, I'll just stick to an array instead of a vector. x_x

On another note, how would one go about determining if an element in an array of strings was empty?

Code:

---

void TurnerBot_Util::copy(char* array[], vString &v) {
    for(int i = 0; i < TURNERBOT_MAX_RESP; ++i) {
        if(array[i] != NULL) {
            v.push_back(array[i]);
        } else {
            break;
        }
    }
}

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That's an old function I have, but I need to make it work for a std::string element. This was my feeble attempt at it, but it doesn't compile. Tells me that there's no operator to test for equality in a string?

Code:

---

void TurnerBot_Util::copy(std::string array[], vString &v) {
    for(int i = 0; i < TURNERBOT_MAX_RESP; ++i) {
        if(array[i] != NULL) {
            v.push_back(array[i]);
        } else {
            break;
        }
    }
}

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Unfortunately, vector lacks initializers. But C++0x should fix that. Until then, you can try to make your own or live with it.

>how would one go about determining if an element in an array of strings was empty?

Code:

---

if ( s.empty() ) {
  // I'm an empty string
}
else {
  // I'm not empty!
}

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>Tells me that there's no operator to test for equality in a string?
Not against an integer, which NULL is in C++:

Code:

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#define NULL 0

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>Yep. First time?
It's especially shocking as I prefer a tab stop of 2...