| 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 | |||||||||||||||||||||||||||||||
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| Interpolations | |||||||||||||||||||||||||||||||
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| Generic numeric operations | |||||||||||||||||||||||||||||||
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| C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
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| Member functions | ||||
slice_array::operator= | ||||
void operator=(const T& value)const; | (1) | |
void operator=(conststd::valarray<T>& val_arr)const; | (2) | |
const slice_array& operator=(const slice_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::slice_array to assign |
#include <iostream>#include <valarray> void print(charconst* remark,std::valarray<int>const& v={}){std::cout<< remark;if(v.size()!=0){std::cout<<':';for(int e: v)std::cout<<' '<< e;}std::cout<<'\n';} int main(){std::valarray<int> v1{1,2,3,4,5,6,7,8};std::slice_array<int> s1= v1[std::slice(1,4,2)]; print("v1", v1); print("s1", s1); print("\n(1) operator=( const T& )"); print("s1 = 42"); s1=42;// (1) print("s1", s1); print("v1", v1); print("\n(2) operator=( const std::valarray<T>& )");std::valarray<int> v2{10,11,12,13,14,15}; print("v2", v2); print("s1 = v2"); s1= v2;// (2) print("s1", s1); print("v1", v1); print("\n(3) operator=( const slice_array& )"); v1={1,2,3,4,5,6,7,8};std::slice_array<int> s2= v1[std::slice(0,4,1)];std::slice_array<int> s3= v2[std::slice(1,4,1)]; print("v1", v1); print("v2", v2); print("s2", s2); print("s3", s3); print("s2 = s3"); s2= s3;// (3) Note: LHS and RHS must have same size. print("s2", s2); print("v1", v1);}
Output:
v1: 1 2 3 4 5 6 7 8s1: 2 4 6 8 (1) operator=( const T& )s1 = 42s1: 42 42 42 42v1: 1 42 3 42 5 42 7 42 (2) operator=( const std::valarray<T>& )v2: 10 11 12 13 14 15s1 = v2s1: 10 11 12 13v1: 1 10 3 11 5 12 7 13 (3) operator=( const slice_array& )v1: 1 2 3 4 5 6 7 8v2: 10 11 12 13 14 15s2: 1 2 3 4s3: 11 12 13 14s2 = s3s2: 11 12 13 14v1: 11 12 13 14 5 6 7 8
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 |
