Re: [Boost-users] [boost-users][lambda] crash in std::for_each

On Tue, Feb 3, 2009 at 5:00 PM, Steven Watanabe wrote:

AMDG

Stuart Dootson wrote:

...

Try changing the string_pair typedef to:

std::pair string_pair;

Not 100% sure *why* this makes it run rather than crash (with VC++ 2008, Boost 1.37.0), but it makes some sort of sense, as the key in a map is immutable.

The reason is that std::pairs can be converted to each other. If the type doesn't match exactly: 1) It will be implicitly converted to the correct type. 2) Then you get a reference to first. 3) Then the temporary created in step 1 is destroyed 4) Then you stream first (which has just been destroyed)

In Christ, Steven Watanabe

Thanks Steven - it's always good to get some educashun! :-) Stuart D