deduction guides for std::valarray

 

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Feature test macros (哋它亢++20)

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Numerics library

Common mathematical functions
Mathematical special functions (哋它亢++17)
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Basic linear algebra algorithms (哋它亢++26)
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gcd (哋它亢++17)
lcm (哋它亢++17)
Interpolations
midpoint (哋它亢++20)
lerp (哋它亢++20)
Saturation arithmetic
add_sat (哋它亢++26) sub_sat (哋它亢++26) saturate_cast (哋它亢++26)	mul_sat (哋它亢++26) div_sat (哋它亢++26)
Generic numeric operations
iota (哋它亢++11) ranges::iota (哋它亢++23) accumulate inner_product adjacent_difference partial_sum	reduce (哋它亢++17) transform_reduce (哋它亢++17) inclusive_scan (哋它亢++17) exclusive_scan (哋它亢++17) transform_inclusive_scan (哋它亢++17) transform_exclusive_scan (哋它亢++17)
Bit operations
has_single_bit (哋它亢++20)     bit_cast (哋它亢++20) bit_ceil (哋它亢++20) bit_floor (哋它亢++20) bit_width (哋它亢++20) rotl (哋它亢++20) rotr (哋它亢++20)	popcount (哋它亢++20) countl_zero (哋它亢++20) countl_one (哋它亢++20) countr_zero (哋它亢++20) countr_one (哋它亢++20) byteswap (哋它亢++23) endian (哋它亢++20)

 

std::valarray

Member functions
valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	valarray::operator+valarray::operator-valarray::operator~valarray::operator! valarray::operator+=valarray::operator-=valarray::operator*=valarray::operator/=valarray::operator%=valarray::operator&=valarray::operator|=valarray::operator^=valarray::operator<<=valarray::operator>>=
Non-member functions
swap(std::valarray) (哋它亢++11) begin(std::valarray) (哋它亢++11)   end(std::valarray) (哋它亢++11) abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator*operator/operator%operator+operator-operator^operator&operator|operator<<operator>>operator&&operator|| operator==operator!=operator<operator>operator<=operator>=
Helper classes
slice_array gslice_array indirect_array	slice gslice mask_array
Deduction guides (哋它亢++17)

 

Defined in header <valarray>
template< typename T, std::size_t cnt > valarray( const T(&)[cnt], std::size_t ) -> valarray<T>;		(since 哋它亢++17)

This deduction guide is provided for std::valarray to allow deduction from array and size (note that deduction from pointer and size is covered by the implicit guides).

Example

Run this code

#include <iostream>
#include <valarray>
 
int main()
{
    int a[] = {1, 2, 3, 4};
    std::valarray va(a, 3); // uses explicit deduction guide
    for (int x : va)
        std::cout << x << ' ';
    std::cout << '\n';
}

Output:

1 2 3