Classic: String to Boolean..;=(

Projects Programming
1

I parse a SMS (String) to substrings, so i can't avoid Strings.
The (sub)String is called StringFoo and is "1".
I want to write that 1 into a struct. The scruct contains chars[] and booleans, like

typedef struct {
  boolean booleanBar;
  char charBar[20];
} userstruct;
userstruct owner;

StringFoo.toCharArray(owner.charBar, 20);

works perfect.

I search for an elegant way for the boolean, something like:

StringFoo.toBool(owner.booleanBar, 1);

Do i have to build a (if then) thing ? Do i just don't see the obvious? It' kind of ugly anyway...

Thx for hints!

2

That may be true, but possibly not

Please post a complete sketch rather than just an isolated snippet so that we can see what you are doing in context

3

if you get 0 when you want false and 1 (or any other number) when true, then Try

owner.booleanBar = StringFoo.toInt();

C++ has a rule that implicitly converts 0 into false and any other integer into true.

4 

owner.booleanBar = StringFoo != "0";
5

this offers better type coherence so I like the idea, but it's costly.

Same idea but cheaper

owner.booleanBar = *(StringFoo.c_str()) != '0';

6

Why not StringFoo[0]

7

yes that works too or charAt(0) . (but more costly because of the bound check )

8

That's it!! Thx a bunch!

9

that's costly too in terms of compute time.

the fastest is probably

owner.booleanBar = *(StringFoo.c_str()) != '0';

that means "take the first character from the string and compare it to '0')

10

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