From cppreference.com
constexprsize_typefind(basic_string_viewv,size_typepos=0)constnoexcept; (1) (since C++17)constexprsize_typefind(CharTch,size_typepos=0)constnoexcept; (2) (since C++17)constexprsize_typefind(constCharT*s,size_typepos,size_typecount)const; (3) (since C++17)constexprsize_typefind(constCharT*s,size_typepos=0)const; (4) (since C++17)Finds the first substring equal to the given character sequence.
1) Finds the first occurence of v in this view, starting at position pos.
2) Equivalent to find(basic_string_view(std::addressof(ch),1),pos).
3) Equivalent to find(basic_string_view(s,count),pos).
4) Equivalent to find(basic_string_view(s),pos).
Parameters
v - view to search for pos - position at which to start the search count - length of substring to search for s - pointer to a character string to search for ch - character to search for Return value
Position of the first character of the found substring, or
if no such substring is found.
Complexity
O(
* v.
) at worst.
Example
Run this code
#include<string_view>intmain(){usingnamespacestd::literals;constexprautostr{" long long int;"sv};static_assert(1==str.find("long"sv)&&"<- find(v , pos = 0)"&&6==str.find("long"sv,2)&&"<- find(v , pos = 2)"&&0==str.find(' ')&&"<- find(ch, pos = 0)"&&2==str.find('o',1)&&"<- find(ch, pos = 1)"&&2==str.find("on")&&"<- find(s , pos = 0)"&&6==str.find("long double",5,4)&&"<- find(s , pos = 5, count = 4)");static_assert(str.npos==str.find("float"));}See also
find the last occurrence of a substring
(public member function)
find first occurrence of characters
(public member function)
find last occurrence of characters
(public member function)
find first absence of characters
(public member function)
find last absence of characters
(public member function)
finds the first occurrence of the given substring
(public member function of std::basic_string<CharT,Traits,Allocator>)