Created
November 10, 2012 06:42
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Removing punctuation from strings in C++98 and C++11
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#include <string> | |
#include <iostream> | |
#include <cctype> | |
#include <iterator> | |
#include <algorithm> | |
#include <functional> | |
using namespace std; | |
int main() | |
{ | |
string before = "~$foo%(*bar@$|", after; | |
cout << "before: " << before << endl; | |
// C++98, remove all punctuation by copying | |
remove_copy_if(before.begin(), before.end(), back_inserter(after), ptr_fun<int, int>(ispunct)); | |
cout << "after copy (C++98): " << after << endl; | |
after.erase(); | |
// C++11, remove all punctuation by copying | |
remove_copy_if(begin(before), end(before), back_inserter(after), [] (char c) { return ispunct(c); }); | |
cout << "after copy (C++11): " << after << endl; | |
// C++98, remove in place using erase-remove idiom | |
before.erase(remove_if(before.begin(), before.end(), ptr_fun<int, int>(ispunct)), before.end()); | |
cout << "in-place: " << before << endl; | |
before = "...don't..."; | |
cout << "before: " << before << endl; | |
// C++98, remove only leading and trailing punctuation but not interior | |
// note: this is undefined behavior if the string contains all punctuation | |
// (that can be fixed by assigning the two iterators to variables and checking that they aren't equal) | |
after = string(find_if(before.begin(), before.end(), not1(ptr_fun<int, int>(ispunct))), | |
find_if(before.rbegin(), before.rend(), not1(ptr_fun<int, int>(ispunct))).base()); | |
cout << "after: " << after << endl; | |
} |
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$ g++ -Wall -Wextra -pedantic -std=c++11 -O2 20121109.cpp -o 20121109 && ./20121109 | |
before: ~$foo%(*bar@$| | |
after copy (C++98): foobar | |
after copy (C++11): foobar | |
in-place: foobar | |
before: ...don't... | |
after: don't |
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