C++ 11 - STL - 函数对象(Function Object) (下)

deque<int> coll = { 1, 2, 3, 5, 7, 11, 13, 17, 19 };

PRINT_ELEMENTS(coll, "initialized: ");

// negate all values in coll
transform(coll.cbegin(), coll.cend(),      // source
    coll.begin(),                   // destination
    negate<int>());                 // operation
PRINT_ELEMENTS(coll, "negated:     ");

// square all values in coll
transform(coll.cbegin(), coll.cend(),      // first source
    coll.cbegin(),                  // second source
    coll.begin(),                   // destination
    multiplies<int>());             // operation
PRINT_ELEMENTS(coll, "squared:     ");

using namespace std::placeholders;

set<int, greater<int>> coll1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
deque<int> coll2;

// Note: due to the sorting criterion greater<>() elements have reverse order:
PRINT_ELEMENTS(coll1, "initialized: ");

// transform all elements into coll2 by multiplying them with 10
transform(coll1.cbegin(), coll1.cend(),      // source
    back_inserter(coll2),             // destination
    bind(multiplies<int>(), _1, 10));   // operation
PRINT_ELEMENTS(coll2, "transformed: ");

// replace value equal to 70 with 42
replace_if(coll2.begin(), coll2.end(),       // range
    bind(equal_to<int>(), _1, 70),     // replace criterion
    42);                             // new value
PRINT_ELEMENTS(coll2, "replaced:    ");

// remove all elements with values between 50 and 80
coll2.erase(remove_if(coll2.begin(), coll2.end(),
    bind(logical_and<bool>(),
    bind(greater_equal<int>(), _1, 50),
    bind(less_equal<int>(), _1, 80))),
    coll2.end());
PRINT_ELEMENTS(coll2, "removed:     ");