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129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
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//[mitchell02_customer_manager
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#include <boost/contract.hpp>
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#include <boost/detail/lightweight_test.hpp>
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#include <string>
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#include <map>
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#include <utility>
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// Basic customer information.
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struct customer_info {
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typedef std::string identifier;
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identifier id;
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explicit customer_info(identifier const& _id) :
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id(_id), name_(), address_(), birthday_() {}
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private:
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std::string name_;
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std::string address_;
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std::string birthday_;
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friend class customer_manager;
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};
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// Manage customers.
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class customer_manager {
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public:
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void invariant() const {
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BOOST_CONTRACT_ASSERT(count() >= 0); // Non-negative count.
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}
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/* Creation */
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customer_manager() {
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auto c = boost::contract::constructor(this); // Check invariants.
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}
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virtual ~customer_manager() {
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auto c = boost::contract::destructor(this); // Check invariants.
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}
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/* Basic Queries */
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int count() const {
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auto c = boost::contract::public_function(this); // Check invariants.
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return customers_.size();
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}
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bool id_active(customer_info::identifier const& id) const {
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auto c = boost::contract::public_function(this); // Check invariants.
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return customers_.find(id) != customers_.cend();
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}
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/* Derived Queries */
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std::string const& name_for(customer_info::identifier const& id) const {
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auto c = boost::contract::public_function(this)
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(id_active(id)); // Active.
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})
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;
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// Find != end because of preconditions (no defensive programming).
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return customers_.find(id)->second.name_;
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}
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/* Commands */
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void add(customer_info const& info) {
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auto old_count = BOOST_CONTRACT_OLDOF(count());
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auto c = boost::contract::public_function(this)
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.precondition([&] {
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// Not already active.
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BOOST_CONTRACT_ASSERT(!id_active(info.id));
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(count() == *old_count + 1); // Count inc.
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BOOST_CONTRACT_ASSERT(id_active(info.id)); // Activated.
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})
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;
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customers_.insert(std::make_pair(info.id, customer(info)));
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}
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void set_name(
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customer_info::identifier const& id, std::string const& name) {
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auto c = boost::contract::public_function(this)
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(id_active(id)); // Already active.
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(name_for(id) == name); // Name set.
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})
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;
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// Find != end because of precondition (no defensive programming).
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customers_.find(id)->second.name_ = name;
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}
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private:
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class agent {}; // Customer agent.
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struct customer : customer_info {
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agent managing_agent;
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std::string last_contact;
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explicit customer(customer_info const& info) : customer_info(info),
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managing_agent(), last_contact() {}
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};
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std::map<customer_info::identifier, customer> customers_;
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};
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int main() {
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customer_manager m;
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customer_info const js("john_smith_123");
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m.add(js);
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m.set_name(js.id, "John Smith");
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BOOST_TEST_EQ(m.name_for(js.id), "John Smith");
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BOOST_TEST_EQ(m.count(), 1);
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BOOST_TEST(m.id_active(js.id));
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return boost::report_errors();
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}
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//]
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