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* Some refactoring of the exception handling code so that we can catch

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Nix expression assertion failures.
This commit is contained in:
Eelco Dolstra 2006-03-08 14:11:19 +00:00
parent fa72ae1e9c
commit 9088dee9e2
5 changed files with 45 additions and 22 deletions
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7
src/libutil/util.cc
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@ -25,6 +25,13 @@ Error::Error(const format & f)
}
Error & Error::addPrefix(const format & f)
{
err = f.str() + err;
return *this;
}
SysError::SysError(const format & f)
: Error(format("%1%: %2%") % f.str() % strerror(errno))
{

14
src/libutil/util.hh
View file

@ -26,6 +26,7 @@ public:
~Error() throw () { };
const char * what() const throw () { return err.c_str(); }
const string & msg() const throw () { return err; }
Error & addPrefix(const format & f);
};
class SysError : public Error
@ -34,11 +35,14 @@ public:
SysError(const format & f);
};
class UsageError : public Error
{
public:
UsageError(const format & f) : Error(f) { };
};
#define MakeError(newClass, superClass) \
class newClass : public superClass \
{ \
public: \
newClass(const format & f) : superClass(f) { }; \
};
MakeError(UsageError, Error)
typedef list<string> Strings;