int main(int argc, char **argv)
{
QApplication app( argc, argv );
typedef QMap<QString, Employee> EmployeeMap;
EmployeeMap map;
map["JD001"] = Employee("John", "Doe", 50000);
map["JD002"] = Employee("Jane", "Williams", 80000);
map["TJ001"] = Employee("Tom", "Jones", 60000);
Employee sasha( "Sasha", "Hind", 50000 );
map["SH001"] = sasha;
sasha.setSalary( 40000 );
EmployeeMap::Iterator it;
for ( it = map.begin(); it != map.end(); ++it ) {
printf( "%s: %s, %s earns %d\n",it.key().latin1(),it.data().surname().latin1(),it.data().forename().latin1(),it.data().salary() );
}
// 透過find去尋找相對應的值
it = map.find("JD001");
printf( "%s: %s, %s earns %d\n",it.key().latin1(),it.data().surname().latin1(),it.data().forename().latin1(),it.data().salary() );
// 透過find去尋找, 若找不到會回傳值為end()
it = map.find("Hello");
if (it == map.end())
{
qWarning("do not find the element");
}
return 0;
}
int main()
{
Employee emp[5] =
{ Employee("张三","平安大街3号", "北京", "100000"),
Employee("李四","王府井大街20号", "北京", "100000"),
Employee("赵刚","中山路112号", "重庆", "400000"),
Employee("陈芳","南京路234号", "上海", "200000"),
Employee("周欣","人民东路476号", "重庆", "400000")};
for(int i=0;i<5;i++)
emp[i].display();
}
int main()
{
std::vector<Employee> v = {
Employee(108, "Zaphod"),
Employee(32, "Arthur"),
Employee(108, "Ford"),
};
std::stable_sort(v.begin(), v.end());
for (const Employee &e : v) {
std::cout << e.age << ", " << e.name << '\n';
}
}
void TestSTL::predicate_example()
{
// unary predicate example
int array[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int sizeArray = sizeof(array)/sizeof(array[0]);
std::vector<int> myVector(array, array + sizeArray); //fill a vector
/**
* std::countf_if algorithm: counts the number of elements that satisfy the
* condition we supply (e.g isEven, isNegative)
*/
int res = std::count_if(myVector.begin(), myVector.end(), NumericUtilities::isEven); //returns the how many numbers are even
TESTIFY_ASSERT(res == 6);
res = std::count_if(myVector.begin(), myVector.end(), NumericUtilities::isNegative); //returns how many numbers are negative
TESTIFY_ASSERT( res == 0);
//binary predicates:
Employee staff[] = { Employee(3, "Jonny"), Employee(2, "Bob"), Employee(20, "Filomela")};
int staffSize = sizeof(staff)/sizeof(staff[0]);
std::vector<Employee> myStaff( staff, staff + staffSize); //fill a vector with these employees
/**
* std::sort algorithm: sorts the elements, from a range, into ascending order
*/
//sort by experience
std::sort(myStaff.begin(), myStaff.end(), lessExperience); //supply a binary predicate for comparing employees
TESTIFY_ASSERT( myStaff[0].getExperience() == 2);
TESTIFY_ASSERT( myStaff[1].getExperience() == 3);
TESTIFY_ASSERT( myStaff[2].getExperience() == 20);
}
QString forename() const { return fn; }
QString surname() const { return sn; }
int salary() const { return sal; }
void setSalary( int salary ) { sal = salary; }
private:
QString fn;
QString sn;
int sal;
};
typedef Q3ValueList<Employee> EmployeeList;
EmployeeList list;
list.append( Employee("John", "Doe", 50000) );
list.append( Employee("Jane", "Williams", 80000) );
list.append( Employee("Tom", "Jones", 60000) );
Employee mary( "Mary", "Hawthorne", 90000 );
list.append( mary );
mary.setSalary( 100000 );
EmployeeList::iterator it;
for ( it = list.begin(); it != list.end(); ++it )
cout << (*it).surname().latin1() << ", " <<
(*it).forename().latin1() << " earns " <<
(*it).salary() << endl;
// Output:
// Doe, John earns 50000
/**
* Function for illustrating predicates
*/
void STLMoblet::predicates_explained()
{
LOG("\n");
LOG("========================= about predicates ======================================================================");
LOG("/**");
LOG("* A predicate is a function that returns a boolean value based on some");
LOG("* comparison criterion.");
LOG("* Predicates are used usually with STL algorithms.");
LOG("* Binary predicates - predicates that take two arguments.");
LOG("* Unary predicates - predicates taking one argument.");
LOG("* Usually binary predicates are used with algorithms that need to compare two");
LOG("* elements (e.g sorting algorithms).");
LOG("*/");
LOG("\n");
LOG(" Example using predicates: ");
LOG("\n Unary predicate example...");
int array[] = { 0, 1, 2, 3, 4};
int sizeArray = sizeof(array)/sizeof(array[0]);
std::vector<int> myVector(array, array + sizeArray); //fill a vector
log_to_console(myVector, "myVector contains: ");
LOG("/**");
LOG("* std::countf_if algorithm: counts the number of elements that satisfy the");
LOG("* condition we supply (e.g isEven, isNegative)");
LOG("*/");
log_to_console("Calling: std::count_if(myVector.begin(), myVector.end(), "
"isEven);");
int res = std::count_if(myVector.begin(), myVector.end(),
NumericUtilities::isEven); //returns the how many numbers are even
log_to_console(res, "int res = std::count_if(myVector.begin(), myVector.end(), "
"isEven); //res = ");
log_to_console("\n Binary predicate example...");
Employee staff[] = { Employee(3, "Jonny"),
Employee(2, "Bob"),
Employee(20, "Filomela")};
int staffSize = sizeof(staff)/sizeof(staff[0]);
std::vector<Employee> myStaff( staff, staff + staffSize);
log_to_console(myStaff, "myStaff contains: ");
LOG("\n");
LOG("/**");
LOG("* std::sort algorithm: sorts the elements, from a range, into ascending");
LOG("* order");
LOG("* lessExperience - a binary predicate for comparing employees");
LOG("*/");
LOG("\n");
TRACE(std::sort(myStaff.begin(), myStaff.end(), lessExperiencePredicate));;
log_to_console(myStaff, "myStaff contains now: ");
LOG("\n");
}
void initialize(EMPLOYEELIST& Employees)
{
// Initialize our employee list data source.
Employees.push_back(Employee("Tyler Bennett", "E10297", 32000, "D101"));
Employees.push_back(Employee("John Rappl", "E21437", 47000, "D050"));
Employees.push_back(Employee("George Woltman", "E21437", 53500, "D101"));
Employees.push_back(Employee("Adam Smith", "E21437", 18000, "D202"));
Employees.push_back(Employee("Claire Buckman", "E39876", 27800, "D202"));
Employees.push_back(Employee("David McClellan", "E04242", 41500, "D101"));
Employees.push_back(Employee("Rich Holcomb", "E01234", 49500, "D202"));
Employees.push_back(Employee("Nathan Adams", "E41298", 21900, "D050"));
Employees.push_back(Employee("Richard Potter", "E43128", 15900, "D101"));
Employees.push_back(Employee("David Motsinger", "E27002", 19250, "D202"));
Employees.push_back(Employee("Tim Sampair", "E03033", 27000, "D101"));
Employees.push_back(Employee("Kim Arlich", "E10001", 57000, "D190"));
Employees.push_back(Employee("Timothy Grove", "E16398", 29900, "D190"));
}