使用boost创建一个lambda函数

有 a throw_exception function

For example :

#include <boost/lambda/lambda.hpp>
#include <boost/lambda/exceptions.hpp>
#include <boost/function.hpp>

#include <exception>
#include <iostream>

struct Bar {
    private:
        Bar() {}
};

void Foo(boost::function<Bar(int,int,int)> predicate) {
    std::cout << "should show" << std::endl;
    predicate(1,2,3);
    std::cout << "should not show" << std::endl;
}

int main () {
    Foo( boost::lambda::ret<Bar>(boost::lambda::throw_exception( std::exception() ) ) );
    return 0;
}