std.exception.collectException - multiple declarations
Function collectException
Catches and returns the exception thrown from the given expression.
If no exception is thrown, then null is returned and result is
set to the result of the expression.
T collectException(T, E)(
lazy E expression,
ref E result
);
Note that while collectException can be used to collect any
Throwable and not just Exceptions, it is generally ill-advised to
catch anything that is neither an Exception nor a type derived from
Exception. So, do not use collectException to collect
non-Exceptions unless you're sure that that's what you really want to
do.
Parameters
| Name | Description |
|---|---|
| T | The type of exception to catch. |
| expression | The expression which may throw an exception. |
| result | The result of the expression if no exception is thrown. |
Example
int b;
int foo() { throw new Exception("blah"); }
assert(collectException(foo(), b));
version (D_NoBoundsChecks) {}
else
{
// check for out of bounds error
int[] a = new int[3];
import coreFunction collectException
Catches and returns the exception thrown from the given expression.
If no exception is thrown, then null is returned. E can be
void.
T collectException(T, E)(
lazy E expression
);
Note that while collectException can be used to collect any
Throwable and not just Exceptions, it is generally ill-advised to
catch anything that is neither an Exception nor a type derived from
Exception. So, do not use collectException to collect
non-Exceptions unless you're sure that that's what you really want to
do.
Parameters
| Name | Description |
|---|---|
| T | The type of exception to catch. |
| expression | The expression which may throw an exception. |
Example
int foo() { throw new Exception("blah"); }
writeln(collectException(foo())