public member function
<string>
std::string::push_back
Append character to string
Appends character c to the end of the string, increasing its length by one.
Parameters
- c
- Character added to the string.
Example
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// string::push_back
#include <iostream>
#include <fstream>
#include <string>
int main ()
{
std::string str;
std::ifstream file ("test.txt",std::ios::in);
if (file) {
while (!file.eof()) str.push_back(file.get());
}
std::cout << str << '\n';
return 0;
}
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This example reads an entire file character by character, appending each character to a string object using push_back.
Complexity
Unspecified; Generally amortized constant, but up to linear in the new string length.
Iterator validity
Any iterators, pointers and references related to this object may be invalidated.
Data races
The object is modified.
Exception safety
Strong guarantee: if an exception is thrown, there are no changes in the string.
If the resulting string length would exceed the max_size, a length_error exception is thrown.
A bad_alloc exception is thrown if the function needs to allocate storage and fails.