STLUtilities.cpp
/*
* Copyright (C) 2010 Regents of the University of Michigan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "STLUtilities.h"
namespace STLUtilities
{
//
// Split the string input into words delimited by the character
// delimiter. For a given number of input delimiters, result.size()
// will not change, regardless of the data in between the delimiters.
//
// Refactor this to pre-allocate the word that we place data into,
// then we have minimal data copy.
//
int Tokenize(std::vector<std::string> &result, const char *input, char delimiter)
{
if (*input=='\0')
{
result.clear();
result.resize(1); // one word, and it is empty
return 0;
}
size_t wordCount = 1;
// since input is non-empty, we know we will have at least
// one word, so we allocate it here, and begin to fill it in
if (result.size()<wordCount) result.resize(1);
else result[0].clear();
std::string *word = &result[0];
while (*input)
{
if (*input==delimiter)
{
// we got a delimeter, and since an empty word following
// a delimeter still counts as a word, we allocate it here
wordCount++;
if (result.size()<wordCount) result.resize(wordCount);
else
{
result[wordCount-1].clear();
}
word = &result[wordCount-1];
}
else
{
// save the char in this word
word->push_back(*input);
}
input++;
}
if (wordCount < result.size()) result.resize(wordCount); // potentially truncate to wordCount elements
return result.size();
}
} // end of namespace STLUtilities
STLUtilities
This file is inspired by the poor quality of string support in STL for what should be trivial capabil...
Definition: STLUtilities.cpp:21