U

unary operators, 134, 169

overloaded operator, 552

unary predicate, 386, 418

unary_function deprecated, 579

uncaught exception, 773

undefined behavior, 35, 80

base class destructor not virtual, 622

bitwise operators and signed values, 153

caching end() iterator, 355

cstring functions, 122

dangling pointer, 463

default initialized members of built-in type, 263

delete of invalid pointer, 460

destination sequence too small, 382

element access empty container, 346

invalidated iterator, 107, 353

missing return statement, 224

misuse of smart pointer get, 466

omitting [] when deleting array, 479

operand order of evaluation, 138, 149

out-of-range subscript, 93

out-of-range value assigned to signed type, 35

overflow and underflow, 140

pointer casts, 163

pointer comparisons, 123

return reference or pointer to local variable, 225

string invalid initializer, 361

uninitialized

dynamic object, 458

local variable, 205

pointer, 54

variable, 45

using unconstructed memory, 482

using unmatched match object, 737

writing to a const object, 163

wrong deleter with smart pointer, 480

underflow_error, 197

unformatted IO, 761, 770

istream, 761

multi-byte, istream, 763

single-byte, istream, 761

unget, istream, 761

uniform_int_distribution, 746

uniform_real_distribution, 750

uninitialized, 8, 28, 44, 80

pointer, undefined behavior, 54

variable, undefined behavior, 45

uninitialized_copy, 483

move iterator, 543

uninitialized_fill, 483

union, 847, 864

anonymous, 848, 862

class type member, 848

assignment operators, 850

copy control, 851

default constructor, 850

deleted copy control, 849

placement new, 851

definition, 848

discriminant, 850

restrictions, 847

unique, 384, 878

list and forward_list, 415

unique_copy, 403, 878

unique_ptr, 450, 470–472, 491

* (dereference), 451

copy and assignment, 470

definition, 470, 472

deleter, 472, 491

bound at compile time, 678

dynamically allocated array, 479

initialization, 470

pitfalls, 469

release, 470

reset, 470

return value, 471

transfer ownership, 470

with new, 470

unitbuf, manipulator, 315

unnamed namespace, 791, 818

local to file, 791

replace file static, 792

unordered container, 443, 448

see also container

see also associative container

bucket management, 444

hash<key_type> specialization, 709, 788

compatible with == (equality), 710

key_type requirements, 445

override default hash, 446

unordered_map, 448

see also unordered container

* (dereference), 429

[] (subscript), 435, 448

adds element, 435

at, 435

definition, 423

header, 420

list initialization, 423

word_count program, 444

unordered_multimap, 448

see also unordered container

* (dereference), 429

definition, 423

has no subscript operator, 435

insert, 433

list initialization, 423

unordered_multiset, 448

see also unordered container

insert, 433

iterator, 429

list initialization, 423

override default hash, 446

unordered_set, 448

see also unordered container

header, 420

iterator, 429

list initialization, 423

unscoped enumeration, 832, 864

as union discriminant, 850

conversion to integer, 834

enum, 832

unsigned, 34, 80

char, 34

conversion, 36

conversion from signed, 34

conversion to signed, 160

literal (numU or numu), 41

size return type, 88

unsigned type, 34

unwinding, stack, 773, 818

upper_bound

algorithm, 873

ordered container, 438

used in Basket, 632

uppercase, manipulator, 755

use count, see reference count

user-defined conversion, see class type conversion

user-defined header, 76–77

const and constexpr, 76

default argument, 238

function declaration, 207

#include, 21

inline function, 240

inline member function definition, 273

template definition, 656

template specialization, 708

using =, see type alias declaration

using declaration, 82, 132, 793, 818

access control, 615

not in header files, 83

overloaded function, 800

overloaded inherited functions, 621

scope, 793

using directive, 793, 818

overloaded function, 801

pitfalls, 795

scope, 793, 794

name collisions, 795

utility header, 426, 530, 533, 694