Recent questions tagged stl

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stl - C++: Can I cast a vector <derived_class> to a vector <base_class> during a function call?

I have a existed class and function which look like this: Class base_class{ ... } void Func(...,vector ... help is greatly appreciated. thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

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stl - C++: How do I pass a container of derived classes to a function expecting a container of their base classes?

HI! Anyone know how I can make the line "chug(derlist);" in the code below work? #include <iostream> ... this problem. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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680 views

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stl - C++ Arguments to SGX Enclave Edge Functions

I'm trying to write a simple SGX enclave that takes in a vector of booleans, but apparently edger8r creates c code ... It'll be helpful I think. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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820 views

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stl - c++ "no matching function for call to" error with structure

I have C++ code that maps GUID(unsigned long) to structure. #include <string> #include <map> #include < ... PluginInfo&) What might be wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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666 views

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stl - Is there a standard way to compare two ranges in C++?

By range I mean a pair of iterators. In pseudo C++: std::vector<int> v1 = { 1, 2, 3, 4, 5 }; std: ... like all programmers, I try to be lazy ;-) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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507 views

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stl - Parsing with Boost::Spirit (V2.4) into container

I just started to dig into Boost::Spirit, latest version by now -- V2.4. The essense of my problem is following ... behavior, and if yes -- why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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536 views

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stl - How to negate a predicate function using operator ! in C++?

I want to erase all the elements that do not satisfy a criterion. For example: delete all the characters in a ... what was wrong? Thanks, Chan See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

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stl - Concatenating C++ iterator ranges into a const vector member variable at construction time

I have a class X, which I provide a snippet of here: class X { public: template <typename Iter> X(Iter ... least one extra time, I believe. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - what is the time complexity of std::next_permutation() function in c++?

I wanted to know the time complexity of the next_permutation function. Can I view its code too ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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714 views

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stl - map::lower_bound() equivalent for python's dict class?

I am writing some code that requires me to fetch the lower bound of a key (for simplicity, ignore keys that ... is no better alternative ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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580 views

1 answer

stl - C++ iterator to const_iterator

How do I acquire a const_iterator (of some container class) from an iterator (of that container class) in C++ ... spot as the original does. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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487 views

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stl - Dump hex float in C++

I tried following: std::cout << std::hex << 17.0625; But it dumped it in decimal. I'd like to see 11 ... dump float numbers in hex in STL/boost? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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655 views

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stl - Returning the greatest key strictly less than the given key in a C++ Map

Is there a way the C++ STL Maps support this, since lower_bound and upper_bound on maps strictly return the value ... .3) and then iterator--; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

1 answer

stl - How to convert from UTF-8 to ANSI using standard c++

I have some strings read from the database, stored in a char* and in UTF-8 format (you know, "á" is ... source). Anyone has any suggestions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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547 views

1 answer

stl - What is the lifetime and validity of C++ iterators?

I'm planning to implement a list of Things in C++ where elements might be removed out of order. I don't ... inserted Thing before it's gone. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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533 views

1 answer

stl - What is the lifetime and validity of C++ iterators?

I'm planning to implement a list of Things in C++ where elements might be removed out of order. I don't ... inserted Thing before it's gone. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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614 views

1 answer

stl - What is the lifetime and validity of C++ iterators?

I'm planning to implement a list of Things in C++ where elements might be removed out of order. I don't ... inserted Thing before it's gone. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

890 views

1 answer

stl - How to convert from UTF-8 to ANSI using standard c++

I have some strings read from the database, stored in a char* and in UTF-8 format (you know, "á" is ... source). Anyone has any suggestions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

456 views

1 answer

stl - What is the lifetime and validity of C++ iterators?

I'm planning to implement a list of Things in C++ where elements might be removed out of order. I don't ... inserted Thing before it's gone. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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482 views

1 answer

stl - Simple way to split a sequence of null-separated strings in C++

I have a series of strings stored in a single array, separated by nulls (for example ['f', 'o', 'o', ' ... to make it even simpler. Any takers? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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526 views

1 answer

stl - C++ type suffix _t, _type or none

C++ sometimes uses the suffix _type on type definitions (e.g. std::vector<T>::value_type), also sometimes _t (e ... on when to use which name? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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529 views

1 answer

stl - Custom Exceptions in C++

I've been trying to make some custom exception classes for a C++ library I'm working on. These custom exceptions ... ~RuntimeError() throw(); }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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710 views

1 answer

stl - Compare two vectors C++

I was wondering is there any function to compare 2 string vectors to return the number of different(or the same) ... test item by item. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

1 answer

stl - Is there a standard cyclic iterator in C++

Based on the following question: Check if one string is a rotation of other string I was thinking of ... an already made/tested implementation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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859 views

1 answer

stl - C++ How to find the biggest key in a std::map?

At the moment my solution is to iterate through the map to solve this. I see there is a upper_bound method ... a quicker or more succinct way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

1 answer

stl - How to efficiently compare two maps of strings in C++ only for a subset of the keys

I'm wondering if only by applying some standard algorithms is possible to write a short function which compare ... solution can be achieved. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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695 views

1 answer

stl - C++ std::unordered_map complexity

I've read a lot about unordered_map (c++11) time-complexity here at stackoverflow, but I haven't found ... , average complexity as well. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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717 views

1 answer

stl vector and c++: how to .resize without a default constructor?

How do I tell STL, specifically for the method resize() in vector, to initialize objects with a constructor ... pointers to solve the problem. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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