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Published on 2010-05-12T13:35:23Z
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It seems that I can sort an std::vector<std::pair<int, std::string>>, and it will sort based on the int value. Is this a well defined thing to do? Does std::pair have a default ordering based on it's elements?
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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.
When i debug the unmanaged c++ code the parameter imageSpec_ shows the value correctly…
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After more than a few questions about deciding on C++ books I thought we could make a better community wiki version. Providing QUALITY books and an approximate skill level. Maybe we can add a short blurb/description about each book that you have personally read / benefited from. Feel free to debate…
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I have a large vector (10^9 elements) of chars, and I was wondering what is the fastest way to write such vector to a file. So far I've been using next code:
vector<char> vs;
// ... Fill vector with data
ofstream outfile("nanocube.txt", ios::out | ios::binary);
ostream_iterator<char>…
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I have two questions about STL
1) why STL is not thread-safe? Is there any structure that is thread-safe?
2) How to debug STL using GDB? In GDB, how can I print a vector?
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If you've used C++ you undoubtedly have used the Standard Template Libraries. Designed for in-memory management of data and collections of data this is a core aspect of all C++ programs.
Berkeley DB is a database library with a variety of APIs designed to ease development, one of those APIs extends…
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I have an old structure class like this: typedef vector<vector<string>> VARTYPE_T; which works as a single variable. This variable can hold from one value over a list to data like a table. Most values are long,double, string or double [3] for coordinates (x,y,z). I just convert them as…
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I'm trying to sort a list (part of a class) in descending containg items of a struct but it doesn't compile(error: no match for 'operator-' in '__last - __first'):
sort(Result.poly.begin(), Result.poly.end(), SortDescending());
And here's SortDescending:
struct SortDescending
{
bool operator()(const…
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