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by Miguel Angel
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Published on 2009-05-20T17:40:11Z
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Hi, I'm using std::map to store a lot of elements (pairs of elements) and I have a "little" doubt, what is more efficient to iterate all elements over my std::map, iterator or reverse_iterator?
Thank's.
Salu2.
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I want to learn C++ by using Vim and MinGW as compiler. I'm interesting at "C++ Primer (4th Edition)" and "C++ Primer Plus (5th Edition)" but I don't know how about it different. It has no book store that I can review those books, so I want to know, what is the different between those book and which…
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In unmanaged c++ dll i have a function which takes constant std::string as argument
Prototype : void read ( const std::string &imageSpec_ )
I call this function from managed c++ dll by passing a std::string.
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Hi,
I'm using std::map to store a lot of elements (pairs of elements) and I have a "little" doubt, what is more efficient to iterate all elements over my std::map, iterator or reverse_iterator?
Thank's.
Salu2.
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I am wondering if it is possible to create something like a predicate for a std::map for all of its values so I don't have to edit the values before I insert them into the map.
What I would like is something like this:
mymap["username"] = " Marlon "; // notice the space on both sides of my name
assert(mymap["username"]…
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Hi. That's my first question :)
I'm storing the configuration of my program in a Group->Key->Value form, like the old INIs. I'm storing the information in a pair of structures.
First one, I'm using a std::map with string+ptr for the groups info (the group name in the string key). The second…
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For example, I have a std::map with known sizeof(A) and sizefo(B), while map has N entries inside. How would you estimate its memory usage?
I'd say it's something like
(sizeof(A) + sizeof(B)) * N * factor
But what is the factor? Different formula maybe?
Update: Maybe it's easier to ask for upper…
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I am trying to assign a custom type as a key for std::map. Here is the type which I am using as key.
struct Foo
{
Foo(std::string s) : foo_value(s){}
bool operator<(const Foo& foo1) { return foo_value < foo1.foo_value; }
bool operator>(const Foo& foo1) { return foo_value…
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