Re: [Boost-users] [range] cannot use lambda predicate in adaptor with certain algorithms

Hi, Nathan. This problem is known issue. PStade.Oven Library have solution by regular function. http://p-stade.sourceforge.net/oven/doc/html/oven/utilities.html#oven.utilit... I’ve been doing for now, Oven to Boost.Range porting project. https://github.com/faithandbrave/OvenToBoost Using this library you can write as follow: #include #include #include int main() { int a[] = {1, 2, 3}; auto is_odd = [](int i){ return i % 2 == 1; }; boost::min_element(a | boost::adaptors::filtered(boost::regular(is_odd))); } or, use regular operator(operator|+) version: #include #include int main() { int a[] = {1, 2, 3}; auto is_odd = [](int i){ return i % 2 == 1; }; boost::min_element(a |+ boost::adaptors::filtered(is_odd)); } 2011/5/30 Nathan Ridge :

Hello,

I get errors related to lambdas not being default-constructible or copy-assignable when using a lambda as a predicate with certain adaptors (e.g. filtered) and certain algorithms (e.g. min_element).

The following code illustrates the problem:

#include #include int main() {    int a[] = {1, 2, 3};    auto is_odd = [](int i){ return i % 2 == 1; };    boost::min_element(a | boost::adaptors::filtered(is_odd)); }

The errors are shown below.

Is there a workaround for this?

Thanks, Nate.

...

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