| Common mathematical functions | |||||||||||||||||||||||||||||||
| Mathematical special functions(C++17) | |||||||||||||||||||||||||||||||
| Mathematical constants(C++20) | |||||||||||||||||||||||||||||||
| Basic linear algebra algorithms(C++26) | |||||||||||||||||||||||||||||||
| Data-parallel types (SIMD)(C++26) | |||||||||||||||||||||||||||||||
| Floating-point environment(C++11) | |||||||||||||||||||||||||||||||
| Complex numbers | |||||||||||||||||||||||||||||||
Numeric array (valarray) | |||||||||||||||||||||||||||||||
| Pseudo-random number generation | |||||||||||||||||||||||||||||||
| Bit manipulation(C++20) | |||||||||||||||||||||||||||||||
| Saturation arithmetic(C++26) | |||||||||||||||||||||||||||||||
| Factor operations | |||||||||||||||||||||||||||||||
|
| ||||||||||||||||||||||||||||||
| Interpolations | |||||||||||||||||||||||||||||||
|
| ||||||||||||||||||||||||||||||
| Generic numeric operations | |||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||
| C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||
| Member functions | ||||
indirect_array::operator= | ||||
void operator=(const T& value)const; | (1) | |
void operator=(conststd::valarray<T>& val_arr)const; | (2) | |
const indirect_array& operator=(const indirect_array& other_arr)const; | (3) | |
Assigns values to all referred elements.
Contents |
| value | - | a value to assign to all of the referred elements |
| val_arr | - | std::valarray to assign |
| other_arr | - | std::indirect_array to assign |
#include <iomanip>#include <iostream>#include <numeric>#include <valarray> void print(int n,std::valarray<int>const& v){std::cout<< n<<':';for(int e: v)std::cout<<std::setw(3)<< e;std::cout<<'\n';} int main(){std::valarray<int> v(8);std::iota(std::begin(v),std::end(v),0); print(1, v); std::valarray<std::size_t> idx{1,3,5,7};conststd::indirect_array<int> ia= v[idx];// 'ia' refers to v[1], v[3], v[5], v[7] ia=-1;// (1), effectively:// v[1] = v[3] = v[5] = v[7] = -1; print(2, v); ia=/*std::valarray<int>*/{-1,-2,-3,-4};// (2),// effectively: v[1] = -1, v[3] = -2, v[5] = -3, v[7] = -4; print(3, v); std::valarray<std::size_t> idx2{0,2,4,6};conststd::indirect_array<int> ia2= v[idx2];// 'ia2' refers to v[0], v[2], v[4], v[6] ia= ia2;// (3), effectively:// v[1] = v[0], v[3] = v[2], v[5] = v[4], v[7] = v[6]; print(4, v);}
Output:
1: 0 1 2 3 4 5 6 72: 0 -1 2 -1 4 -1 6 -13: 0 -1 2 -2 4 -3 6 -44: 0 0 2 2 4 4 6 6
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 123 | C++98 | overload (2) was non-const | made const |
| LWG 253 | C++98 | the copy assignment operator was private | made public |
| LWG 621 | C++98 | the copy assignment operator was non-const | made const |
