On Mon, Sep 3, 2012 at 10:28 AM, Stewart, Robert <Robert.Stewart@sig.com> wrote:
Sergey Radionov wrote:
https://github.com/RSATom/finally_execute/blob/master/finally _execute.h
based on http://www.drdobbs.com/cpp/generic-change-the-way- you-write-excepti/184403758?pgno=2
I know about http://sourceforge.net/projects/loki-lib/ but with boost::bind this can be much simpler: https://github.com/RSATom/finally_execute/blob/master/README
I've used this in many of my projects, and found it very usefull....
don't understand, why this simple solution does not contributed already to Boost by someone else... :)
I created a version, too, but the usage is much simpler.
Given the following:
FILE * const file(fopen("test", "r")); if (file) { // A }
Your usage, at A, is:
finally_execute _(make_fin_exec(boost::bind(fclose, file)));
Mine is:
scope_guard _(fclose, file);
As you can see, a little more complication in the component makes usage much simpler.
Boost.ScopeExit allows you to "execute *arbitrary* code when the enclosing scope exits". I don't see how you execute arbitrary code with the above. Yep, but in 90% of cases I just need call one function on scope exit, and in this case ScopeExit will be too cumbersome.
2012/9/4 Lorenzo Caminiti <lorcaminiti@gmail.com>: little example: void foo() { FILE* f1 = fopen( "file1.bin", "rb"); if( !f1 ) return; finally_execute close_file1 = make_fin_exec( boost::bind(fclose, f1) ); FILE* f2 = fopen( "file2.bin", "rb"); if( !f2 ) return; finally_execute close_file1 = make_fin_exec( boost::bind(fclose, f4) ); FILE* f3 = fopen( "file3.bin", "rb"); if( !f3 ) return; finally_execute close_file1 = make_fin_exec( boost::bind(fclose, f4) ); FILE* f4 = fopen( "file4.bin", "rb"); if( !f4 ) return; finally_execute close_file1 = make_fin_exec( boost::bind(fclose, f4) ); } how it will look with ScopeExit? what will be more clear?
http://www.boost.org/doc/libs/1_51_0/libs/scope_exit/doc/html/index.html
There's also Boost.Scope Exit, though it's even more verbose:
BOOST_SCOPE_EXIT(&file) { fclose(file); } BOOST_SCOPE_EXIT_END
If there's interest in it, I'd have to seek permission to submit my library.
_____ Rob Stewart robert.stewart@sig.com Software Engineer using std::disclaimer; Dev Tools & Components Susquehanna International Group, LLP http://www.sig.com
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