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sloppy
Expert Cheater
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Joined: 17 Aug 2008
Posts: 123
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 Posted: Sat Jan 03, 2009 7:37 pm Post subject: Exception handling |
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| Code: | #include <iostream>
#include <string>
int main()
{
try
{
throw std::string("Hello, World?!").c_str();
}
catch (const char *e)
{
std::cout << e << '\n'; // Output: Nothing.
std::cout << ++e; // Output: ello, World?!
}
std::cin.sync();
std::cin.ignore();
return 0;
} |
Seems like the first character has been null terminated, but I'm not really sure why. Any thoughts?
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crayzbeef
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| Posted: Sun Jan 04, 2009 3:32 pm Post subject: |
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| Maybe because you're throwing a string and catching a char?
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Heartless
I post too much
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Joined: 03 Dec 2006
Posts: 2436
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| Posted: Sun Jan 04, 2009 3:37 pm Post subject: |
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_________________
What dosen't kill you, usually does the second time. |
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DeletedUser14087
I post too much
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Joined: 21 Jun 2006
Posts: 3069
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| Posted: Sun Jan 04, 2009 3:40 pm Post subject: |
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That would be bizzare to check excpetion for.
Edit: instead of using sync and ignor to pause instant close, use cin.
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Symbol
I'm a spammer
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Joined: 18 Apr 2007
Posts: 5094
Location: Israel.
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| Posted: Mon Jan 05, 2009 6:30 am Post subject: |
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| crayzbeef wrote: | | Maybe because you're throwing a string and catching a char? |
He throws char*. (String.c_str())
That's pretty odd, but the problem is at c_str, since:
| Code: | try
{
throw "Hello, World!";
}
catch (const char *e)
{
std::cout << e << '\n'; // Output: Hello, World!
} |
Works perfectly fine.
You could also simply do:
| Code: | try
{
throw std::string("Hello, World!");
}
catch (std::string e)
{
std::cout << e.c_str() << '\n';
} |
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sloppy
Expert Cheater
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Joined: 17 Aug 2008
Posts: 123
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| Posted: Mon Jan 05, 2009 5:08 pm Post subject: |
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@Rot1
This is just a test case, not my actual code. You're bizarre. 
@HornyAZNBoy, Symbol
Yea that is my current approach, though it would be nifty to throw a c string.
My best guess is that throw creates a copy of the char pointer (points to an internal buffer of string), which is then being cleaned up by the string object since it is no longer in use. If the string is defined outside the try block it works as you'd expect. D'oh.
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