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Re: Why can switch only compare to const values?
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From: |
Nikos Chantziaras |
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Subject: |
Re: Why can switch only compare to const values? |
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Date: |
Fri, 22 Mar 2013 19:54:38 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 |
On 22/03/13 16:34, Kevin Peterson wrote:
Just curious:
Take a switch-statement like -
switch(myVar)
{
case(label):
...
break;
}
why label should be constant only?
Because it can be ambiguous otherwise:
int a = 1, b = 1;
int val = 1;
switch (val) {
case a: foo(); break;
case b: bar(); break;
}
Requiring constant expressions for the cases makes sure that there's no
ambiguity, since they can be evaluated at compile time.