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Returns the length of the string, in terms of number of characters.
This is the number of actual characters that conform the contents of the basic_string, which is not necessarily equal to its storage capacity.
Both basic_string::size and basic_string::length are synonyms and return the same value.
Member type size_type is an unsigned integral type.
Output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
basic_string
- basic_string::~basic_string
- basic_string::basic_string
member functions
- basic_string::append
- basic_string::assign
- basic_string::at
-
basic_string::backC++11
- basic_string::begin
- basic_string::c_str
- basic_string::capacity
-
basic_string::cbeginC++11
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basic_string::cendC++11
- basic_string::clear
- basic_string::compare
- basic_string::copy
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basic_string::crbeginC++11
-
basic_string::crendC++11
- basic_string::data
- basic_string::empty
- basic_string::end
- basic_string::erase
- basic_string::find
- basic_string::find_first_not_of
- basic_string::find_first_of
- basic_string::find_last_not_of
- basic_string::find_last_of
-
basic_string::frontC++11
- basic_string::get_allocator
- basic_string::insert
- basic_string::length
- basic_string::max_size
- basic_string::operator[]
- basic_string::operator+=
- basic_string::operator=
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basic_string::pop_backC++11
- basic_string::push_back
- basic_string::rbegin
- basic_string::rend
- basic_string::replace
- basic_string::reserve
- basic_string::resize
- basic_string::rfind
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basic_string::shrink_to_fitC++11
- basic_string::size
- basic_string::substr
- basic_string::swap
member constants
non-member overloads
- Reference
- <string>
- basic_string
- length
public member function
<string>
std::basic_string::length
size_type length() const;
size_type length() const noexcept;
Return length of string
This is the number of actual characters that conform the contents of the basic_string, which is not necessarily equal to its storage capacity.
Both basic_string::size and basic_string::length are synonyms and return the same value.
Parameters
noneReturn Value
The number of characters in the string.Member type size_type is an unsigned integral type.
Example
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Output:
The size of str is 11 characters |
Complexity
Unspecified.
Constant.
Iterator validity
No changes.Data races
The object is accessed.Exception safety
No-throw guarantee: this member function never throws exceptions.See also
- basic_string::size
- Return size (public member function)
- basic_string::resize
- Resize string (public member function)
- basic_string::max_size
- Return maximum size (public member function)
- basic_string::capacity
- Return size of allocated storage (public member function)
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Spotted an error? contact us