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How to initialize a vector?
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#11 Oct 14th, 2009
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#12 Oct 14th, 2009
The problem with Dave's suggestion is all those strings are now stored in memory twice -- once in the array of std::strings and again in the vector of strings. That could be a problem if the computer is low on memory, or the array contains thousands of strings. If there is an array of std::strings then there isn't much point to using a vector to hold the same strings.
Last edited by Ancient Dragon; Oct 14th, 2009 at 11:28 pm.
The most important thing in the Olympic Games is not to win but to take part, just as the most important thing in life is not the triumph but the struggle. The essential thing is not to have conquered but to have fought well.
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#13 Oct 15th, 2009
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Originally Posted by Ancient Dragon 
The problem with Dave's suggestion is all those strings are now stored in memory twice -- once in the array of std::strings and again in the vector of strings. That could be a problem if the computer is low on memory, or the array contains thousands of strings. If there is an array of std::strings then there isn't much point to using a vector to hold the same strings.
My "Ballpark?" example was how I understood the question neithan was asking:
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Originally Posted by neithan
I want a vector<string> with some values by default. I wanted to do something like char **strings = {"bla", "blo"}
How to do it with vector<> without using repeated push_backs?
“The essential notion of a socialist society is force.”
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#14 Oct 15th, 2009
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Originally Posted by Dave Sinkula
And this differs from using push_back with some "default" strings how?
The most important thing in the Olympic Games is not to win but to take part, just as the most important thing in life is not the triumph but the struggle. The essential thing is not to have conquered but to have fought well.
-Pierre de Coubertin, The Olympic Creed Inspired by Bishop Ethelbert
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#15 Oct 15th, 2009
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Originally Posted by Ancient Dragon
It doesn't -- unless the strings are read from a file, in which case your example wouldn't work either
push_back , like using a back_inserter with copy perhaps; or maybe something about writing an insert_iterator . 
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#16 Oct 15th, 2009
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Originally Posted by Ancient Dragon
If there is an array of std::strings then there isn't much point to using a vector to hold the same strings.
I think people would use Dave's suggestion to take the advantadges of vector but having it initialized somehow.
I'm surprised array can be inialized directly and vector not. That's kind of a weakness isn't?
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#17 Oct 17th, 2009
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Originally Posted by neithan
I'm surprised array can be inialized directly and vector not. That's kind of a weakness isn't?
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#18 Oct 18th, 2009
BTW, shouldn't:
char *bar(int x)
{
char *text[] = {"one","two","three","four","five"};
return text[x];
}
be char **bar(int x) ?
char *bar(int x)
{
char *text[] = {"one","two","three","four","five"};
return text[x];
}
be char **bar(int x) ?
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#19 Oct 19th, 2009
No.
“The essential notion of a socialist society is force.”
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