Item6

gistfile1.cpp

#include <boost/static_assert.hpp>
#include <type_traits>
#include <vector>

int main() {

    ////////////////// PROXY OBJECTS /////////////////

    {
        auto bools = std::vector<bool>{true, false};

        auto b0 = bools[0];
        //BOOST_STATIC_ASSERT(std::is_same<decltype(b0), bool>());

        auto b1 = bool(bools[1]); // or static_cast<bool>(bools[1])
        BOOST_STATIC_ASSERT(std::is_same<decltype(b1), bool>());
    }

    ///////////////// NUMERIC CONVERSIONS /////////////

    {
        auto doubleFunc = []{ return 1.0; };
        auto anInt = int(doubleFunc()); // or static_cast<int>(doubleFuct());
    }


    ///////////////// DEFAULT CONSTRUCTION /////////////

    {
        struct Thing {};
        struct Thing2 { int i; };

        // Thing aThing();
        auto aThing = Thing();
        auto aThing2 = Thing2();
        auto aVector = std::vector<int>();
        auto an = int();
    }

    ///////////////// CONSTRUCTORS WITH ARGS /////////////

    {
        struct Thing {
            Thing(int i, double d);
            int i;
            double d;
        };

        // Thing aThing(1, 3.0);
        auto aThing = Thing(1, 3.0);
        auto anotherThing = Thing{1, 3.0};
        auto aVector = std::vector<Thing>(3, Thing(1, 3.0));
        auto anotherVector = std::vector<Thing>(3, Thing{1, 3.0});
    }
}