Recent questions tagged stl

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stl - C++ equivalent of StringBuffer/StringBuilder?

Is there a C++ Standard Template Library class that provides efficient string concatenation functionality, similar to ... Java's StringBuffer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - How do you copy the contents of an array to a std::vector in C++ without looping?

I have an array of values that is passed to my function from a different part of the program that I need ... using something similar to memcpy. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - How to declare a vector of atomic in C++

I am intending to declare a vector of atomic variables to be used as counters in a multithreaded programme. Here is ... gcc instead of g++ : See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - How to remove all the occurrences of a char in c++ string

I am using following: replace (str1.begin(), str1.end(), 'a' , '') But this is giving compilation error. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - C++ valarray vs. vector

I like vectors a lot. They're nifty and fast. But I know this thing called a valarray exists. Why would I ... than that, when are they useful? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Can't include C++ headers like vector in Android NDK

When I try to include any C++ class like vector in my Android NDK project (using NDK r5b, the latest), ... really appreciate if someone has any advice. Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - C++ Double Address Operator? (&&)

I'm reading STL source code and I have no idea what && address operator is supposed to do. Here is a ... it have two address operators instead of just one? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - C++ convert vector<int> to vector<double>

What is a good clean way to convert a std::vector<int> intVec to std::vector<double> doubleVec. Or, more generally, to convert two vectors of convertible types? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Why is the C++ initializer_list behavior for std::vector and std::array different?

Code: std::vector<int> x{1,2,3,4}; std::array<int, 4> y{{1,2,3,4}}; Why do I need double curly braces for std::array? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Extending the C++ Standard Library by inheritance?

It is a commonly held belief that the the C++ Standard library is not generally intended to be extended ... returned a null pointer) be standard conforming? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Heterogeneous containers in C++

I saw this nice graphic which classifies which STL container would suit based on different requirements of data such as ... too might not be provided in STL. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - How to avoid memory leaks when using a vector of pointers to dynamically allocated objects in C++?

I'm using a vector of pointers to objects. These objects are derived from a base class, and are being ... of to avoid memory leaks and other problems? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - How to sum up elements of a C++ vector?

What are the good ways of finding the sum of all the elements in a std::vector? Suppose I have a vector ... elements. What are the different ways for the same? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Initializing a static std::map<int, int> in C++

What is the right way of initializing a static map? Do we need a static function that will initialize it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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922 views

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stl - C++ std::set update is tedious: I can't change an element in place

I find the update operation on std::set tedious since there's no such an API on cppreference. So what I currently do ... I don't know exactly how it works..) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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979 views

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stl - How to connect two separate set position values in python vtk?

I put two separate sliders for a stl to move it in X direction and Y direction. For connecting sliders value to ... /how-to-connect-two-separate-set-position-values-in-python-vtk...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - std::vector object is not recognized by my IDE

I define a very simple vector: std::vector v; Then when I want to add an element to this vector I ... .com/questions/65859484/stdvector-object-is-not-recognized-by-my-ide...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Splitting a string into integers using istringstream in C++

I'm trying to use istringstream to split a simple string into a series of integers: #include <string> #include < ... to-store-multiple-long-numbers-from-a-string-into-a-vector...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - Python: how to save individual slices from segmented .nii.gz file

I am performing a vertebrae segmentation task and I've output multiple segmentation.nii.gz files. Each of the ... -how-to-save-individual-slices-from-segmented-nii-gz-file...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - What is the difference between set vs map in C++?

I am still confused by the differences between the map and set datastructures in STL. I know set is storing the values ... /22088607/what-is-the-difference-between-set-vs-map-in-c...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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982 views

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stl - What is the difference between set vs map in C++?

I am still confused by the differences between the map and set datastructures in STL. I know set is storing the values ... /22088607/what-is-the-difference-between-set-vs-map-in-c...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stl - C++, can I statically initialize a std::map at compile time?

If I code this std::map<int, char> example = { (1, 'a'), (2, 'b'), (3, 'c') }; then ... //stackoverflow.com/questions/2172053/c-can-i-statically-initialize-a-stdmap-at-compile-time...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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985 views

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stl - C++, can I statically initialize a std::map at compile time?

If I code this std::map<int, char> example = { (1, 'a'), (2, 'b'), (3, 'c') }; then ... //stackoverflow.com/questions/2172053/c-can-i-statically-initialize-a-stdmap-at-compile-time...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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888 views

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stl - How to declare a vector of atomic in C++

I am intending to declare a vector of atomic variables to be used as counters in a multithreaded programme. Here is ... /questions/13193484/how-to-declare-a-vector-of-atomic-in-c...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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886 views

1 answer

stl - How to declare a vector of atomic in C++

I am intending to declare a vector of atomic variables to be used as counters in a multithreaded programme. Here is ... /questions/13193484/how-to-declare-a-vector-of-atomic-in-c...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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897 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 two std::map< ... maps-of-strings-in-c-only-for-a-subset-of-the-k...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k 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 two std::map< ... maps-of-strings-in-c-only-for-a-subset-of-the-k...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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stl - Is the C++ std::set thread-safe?

I've a question about the thread safety of std::set. As far as I know I can iterate over a set and add ... :https://stackoverflow.com/questions/1362110/is-the-c-stdset-thread-safe...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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