std::basic_string::starts_with

 

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

basic_string_view (C++17)

char_traits

 

std::basic_string

Member functions basic_string::basic_string basic_string::operator= basic_string::assign basic_string::get_allocator Element access basic_string::at basic_string::operator[] basic_string::front (C++11) basic_string::back (C++11) basic_string::data basic_string::c_str basic_string::operator basic_string_view (C++17) Iterators basic_string::beginbasic_string::cbegin (C++11) basic_string::endbasic_string::cend (C++11) basic_string::rbeginbasic_string::crbegin (C++11) basic_string::rendbasic_string::crend (C++11) Capacity basic_string::empty basic_string::sizebasic_string::length basic_string::max_size basic_string::reserve basic_string::capacity basic_string::shrink_to_fit (C++11)

Operations basic_string::clear basic_string::insert basic_string::erase basic_string::push_back basic_string::pop_back (C++11) basic_string::append basic_string::operator+= basic_string::compare basic_string::starts_with (C++20) basic_string::ends_with (C++20) basic_string::replace basic_string::substr basic_string::copy basic_string::resize basic_string::swap Search basic_string::find basic_string::rfind basic_string::find_first_of basic_string::find_first_not_of basic_string::find_last_of basic_string::find_last_not_of Constants basic_string::npos

Non-member functions operator+ operator==operator!=operator<operator>operator<=operator>= swap(std::basic_string) operator<<operator>> getline stoistolstoll (C++11)(C++11)(C++11) stoulstoull (C++11)(C++11) stofstodstold (C++11)(C++11)(C++11) to_string (C++11) to_wstring (C++11) operator""s (C++14) Helper classes hash<std::string>hash<std::wstring>hash<std::u32string>hash<std::u16string> (C++11)(C++11)(C++11)(C++11) hash<std::pmr::string>hash<std::pmr::wstring>hash<std::pmr::u32string>hash<std::pmr::u16string> (C++20)(C++20)(C++20)(C++20) Deduction guides(C++17)

 

bool starts_with(std::basic_string_view<CharT, Traits> x) const noexcept;	(1)	(since C++20)
bool starts_with(CharT x) const noexcept;	(2)	(since C++20)
bool starts_with(const CharT* x) const;	(3)	(since C++20)

Checks if the string begins with the given prefix, where

1) the prefix is a string view (which may be a result of implicit conversion from another std::basic_string)

2) the prefix is a single character

3) the prefix is a C-style string

All three overloads effectively return std::basic_string_view<CharT, Traits>(data(), size()).starts_with(x);

Parameters

x

-

a character sequence or a single character to compare to the start of the string

Return value

true if the string begins with the provided prefix, false otherwise.

See also

ends_with (C++20)	checks if the string ends with the given suffix (public member function)
starts_with (C++20)	checks if the string view starts with the given prefix (public member function of std::basic_string_view)
ends_with (C++20)	checks if the string view ends with the given suffix (public member function of std::basic_string_view)
compare	compares two strings (public member function)
substr	returns a substring (public member function)