valarray(3C++) - valarray(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEvalarray
- An optimized array class for numeric operations.
SYNOPSIS
#include <valarray>
template <class T >
class valarray ;
DESCRIPTION
valarray<T> and associated classes (slice_array, gslice_array,
mask_array, and indirect_array) represent and manipulate one dimen‐
sional arrays of values. Elements in a valarray are indexed sequen‐
tially beginning with zero.
Unlike other classes in the Standard Library, valarray<T> can only be
used with a fairly narrow range of types. This restriction ensures that
numeric operations on a valarray can be as efficient as possible by
avoiding aliasing ambiguities and excess temporaries.
INTERFACE
template <class T> class valarray {
public:
// types
typedef T value_type;
// constructors
valarray( );
explicit valarray(size_t);
valarray(const T&, size_t);
valarray(const T* , size_t);
valarray(const valarray<T>&);
valarray(const slice_array<T>&);
valarray(const gslice_array<T>&);
valarray(const mask_array<T>&);
valarray(const indirect_array<T>&);
// destructor
~valarray();
// operator =
valarray<T>& operator= (const valarray<T>&);
valarray<T>& operator= (const slice_array<T>&);
valarray<T>& operator= (const gslice_array<T>&);
valarray<T>& operator= (const mask_array<T>&);
valarray<T>& operator= (const indirect_array<T>&);
valarray<T>& operator= (const T&);
// operator[]
T operator[] (size_t) const;
T& operator[] (size_t);
valarray<T> operator[](slice) const;
inline slice_array<T> operator[](slice);
valarray<T> operator[](const gslice&) const;
inline gslice_array<T> operator[](const gslice&);
valarray<T> operator[](const valarray<bool>&) const;
inline mask_array<T> operator[](const valarray<bool>&);
valarray<T> operator[](const valarray<size_t>&) const;
inline indirect_array<T> operator[](const valarray<size_t>&);
// unary operators
valarray<T> operator+() const;
valarray<T> operator-() const;
valarray<T> operator~() const;
valarray<bool> operator!() const;
// computed assignment
valarray<T>& operator*= (const valarray<T>&);
valarray<T>& operator/= (const valarray<T>&);
valarray<T>& operator+= (const valarray<T>&);
valarray<T>& operator-= (const valarray<T>&);
valarray<T>& operator%= (const valarray<T>&);
valarray<T>& operator^= (const valarray<T>&);
valarray<T>& operator&= (const valarray<T>&);
valarray<T>& operator|= (const valarray<T>&);
valarray<T>& operator<<= (const valarray<T>&);
valarray<T>& operator>>= (const valarray<T>&);
valarray<T>& operator*= (const T&);
valarray<T>& operator/= (const T&);
valarray<T>& operator%= (const T&);
valarray<T>& operator+= (const T&);
valarray<T>& operator-= (const T&);
valarray<T>& operator^= (const T&);
valarray<T>& operator&= (const T&);
valarray<T>& operator|= (const T&);
valarray<T>& operator<<= (const T&);
valarray<T>& operator>>= (const T&);
// others
size_t size() const;
T sum() const;
T min() const;
T max() const;
valarray<T> shift(int) const;
valarray<T> cshift(int) const;
valarray<T> apply(T func(T)) const;
valarray<T> apply(T func(const T&)) const;
void free();
void resize(size_t, const T& = T() );
};
// Non-member binary operators
template<class T> valarray<T>
operator* (const valarray<T>& , const valarray<T>& );
template<class T> valarray<T>
operator/ (const valarray<T>& , const valarray<T>& );
template<class T> valarray<T>
operator% (const valarray<T>&, const valarray<T>&);
template<class T> valarray<T>
operator+ (const valarray<T>& , const valarray<T>& );
template<class T> valarray<T>
operator- (const valarray<T>& , const valarray<T>& );
template<class T> valarray<T>
operator^ (const valarray<T>&, const valarray<T>&);
template<class T> valarray<T>
operator& (const valarray<T>&, const valarray<T>&);
template<class T> valarray<T>
operator| (const valarray<T>&, const valarray<T>&);
template<class T> valarray<T>
operator<< (const valarray<T>&, const valarray<T>&);
template<class T> valarray<T>
operator>> (const valarray<T>&, const valarray<T>&);
template<class T> valarray<T>
operator* (const valarray<T>& , const T& );
template<class T> valarray<T>
operator/ (const valarray<T>& , const T& );
template<class T> valarray<T>
operator% (const valarray<T>&, const T&);
template<class T> valarray<T>
operator+ (const valarray<T>& , const T& );
template<class T> valarray<T>
operator- (const valarray<T>& , const T& );
template<class T> valarray<T>
operator^ (const valarray<T>&, const T&);
template<class T> valarray<T>
operator& (const valarray<T>&, const T&);
template<class T> valarray<T>
operator| (const valarray<T>&, const T&);
template<class T> valarray<T>
operator<< (const valarray<T>&, const T&);
template<class T> valarray<T>
operator>> (const valarray<T>&, const T&);
template<class T> valarray<T>
operator* (const T& , const valarray<T>& );
template<class T> valarray<T>
operator/ (const T& , const valarray<T>& );
template<class T> valarray<T>
operator% (const T&, const valarray<T>&);
template<class T> valarray<T>
operator+ (const T& , const valarray<T>& );
template<class T> valarray<T>
operator- (const T& , const valarray<T>& );
template<class T> valarray<T>
operator^ (const T&, const valarray<T>&);
template<class T> valarray<T>
operator& (const T&, const valarray<T>&);
template<class T> valarray<T>
operator| (const T&, const valarray<T>&);
template<class T> valarray<T>
operator<< (const T&, const valarray<T>&);
template<class T> valarray<T>
operator>> (const T&, const valarray<T>&);
// Non-member logical operators
template<class T> valarray<bool>
operator== (const valarray<T>& , const valarray<T>& );
template<class T> valarray<bool>
operator!= (const valarray<T>& , const valarray<T>& );
template<class T> valarray<bool>
operator< (const valarray<T>& , const valarray<T>& );
template<class T> valarray<bool>
operator> (const valarray<T>& , const valarray<T>& );
template<class T> valarray<bool>
operator<= (const valarray<T>& , const valarray<T>& );
template<class T> valarray<bool>
operator>= (const valarray<T>& , const valarray<T>& );
template<class T> valarray<bool>
operator|| (const valarray<T>& , const valarray<T>&);
template<class T> valarray<bool>
operator&& (const valarray<T>&, const valarray<T>&);
template<class T> valarray<bool>
operator== (const valarray<T>& , const T& );
template<class T> valarray<bool>
operator!= (const valarray<T>& , const T& );
template<class T> valarray<bool>
operator< (const valarray<T>& , const T& );
template<class T> valarray<bool>
operator> (const valarray<T>& , const T& );
template<class T> valarray<bool>
operator<= (const valarray<T>& , const T& );
template<class T> valarray<bool>
operator>= (const valarray<T>& , const T& );
template<class T> valarray<bool>
operator|| (const valarray<T>& , const T& ); template<class T> valar‐
ray<bool>
operator&& (const valarray<T>&, const T&);
template<class T> valarray<bool>
operator== (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator!= (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator< (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator> (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator<= (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator>= (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator|| (const T& , const valarray<T>& );
template<class T> valarray<bool>
operator&& (const T&, const valarray<T>&);
// non-member transcendental functions
template<class T> valarray<T> abs(const valarray<T>& );
template<class T> valarray<T> acos(const valarray<T>& );
template<class T> valarray<T> asin(const valarray<T>& );
template<class T> valarray<T> atan(const valarray<T>& );
template<class T> valarray<T> cos(const valarray<T>& );
template<class T> valarray<T> cosh(const valarray<T>& );
template<class T> valarray<T> exp(const valarray<T>& );
template<class T> valarray<T> log(const valarray<T>& );
template<class T> valarray<T> log10(const valarray<T>& );
template<class T> valarray<T> sinh(const valarray<T>& );
template<class T> valarray<T> sin(const valarray<T>& );
template<class T> valarray<T> sqrt(const valarray<T>& );
template<class T> valarray<T> tan(const valarray<T>& );
template<class T> valarray<T> tanh(const valarray<T>& );
template<class T> valarray<T>
atan2(const valarray<T>& , const valarray<T>& );
template<class T> valarray<T>
atan2(const valarray<T>& , const T& );
template<class T> valarray<T>
atan2(const T& , const valarray<T>& );
template<class T> valarray<T>
pow(const valarray<T>& , const valarray<T>& );
template<class T> valarray<T>
pow(const valarray<T>& , const T& );
template<class T> valarray<T>
pow(const T& , const valarray<T>& );
CONSTRUCTORSvalarray();
Creates a valarray of length zero.
explicit valarray(size_t n);
Creates a valarray of length n, containing n values initialized with the
default value for type T. T must have a default constructor.
explicit valarray(const T& value, size_t n);
Creates a valarray of length n, containing n values initialized with value.
explicit valarray(const T* value, size_t n);
Creates a valarray of length n, containing n values initialized with the
first n elements pointed to by value. The array pointed to by value must
contain at least n values.
valarray(const valarray<;T>& x);
Creates a copy of x.
valarray(const slice_array<;T>& x);
Creates a valarray from the slice_array x.
valarray(const gslice_array<;T>& x);
Creates a valarray from the gslice_array x.
valarray(const mask_array<;T>& x);
Creates a valarray from the mask_array x.
valarray(const indirect_array<;T>& x);
Creates a valarray from the indirect_array x.
DESTRUCTORS
~valarray();
Applies ~T() to every element in the valarray and returns all allocated
memory.
ASSIGNMENT OPERATORS
valarray<T>&
operator=(const valarray<T>& x);
Assigns to each element of self the corresponding value from x. If self has
more or fewer elements than x, then self is resized to match the size of x.
Returns a reference to self.
valarray<;T>&
operator=(const T& x);
Assigns to each element of self the value of x. Returns a reference to
self.
valarray<;T>&
operator=(const slice_array<T>& x);
Copies elements from x into self by stepping through each slice consecu‐
tively. If self has more or fewer elements than x, then self is resized to
match the size of x. Returns a reference to self.
valarray<;T>&
operator=(const gslice_array<T>& x);
Copies elements from x into self by stepping through each slice consecu‐
tively. If self has more or fewer elements than x, then self is resized to
match the size of x. Returns a reference to self.
valarray<;T>&
operator=(const mask<T>& x);
Copies each consecutive element from x into self. If self has more or fewer
elements than x, then self is resized to match the size of x. Returns a
reference to self.
valarray<;T>&
operator=(const indirect_array<T>& x);
Copies each consecutive element from x into self. If self has more or fewer
elements than x, then self is resized to match the size of x. Returns a
reference to self.
REFERENCE OPERATORS
T& operator[](size_type n);
Returns a reference to element n of self. The result can be used as an
lvalue. This reference is valid until the resize function is called or the
array is destroyed. The index n must be between 0 and size less one.
T operator[](size_type n) const;
Returns the value at element n of self. The index n must be between 0 and
size less one.
SUBSET OPERATORS
valarray<T> operator[](slice s) const;
Returns a subset of the self as specified by s. The return value is a new
valarray object. See slice for a description of a BLAS-like slice.
slice_array<;T> operator[](slice s);
Returns a subset of the self as specified by s. The return value is a
slice_array referencing elements inside self. See slice and slice_array.
valarray<;T> operator[](const gslice& s) const;
Returns a subset of the self as specified by s. The return value is a new
valarray object. See gslice for a description of a generalized slice.
gslice_array<;T> operator[](const gslice& s);
Returns a subset of the self as specified by s. The return value is a
gslice_array referencing elements inside self. See gslice and gslice_array.
valarray<;T> operator[](const valarray<bool>& v) const;
Returns a subset of the self as specified by s. The return value is a new
valarray object.
mask_array<;T> operator[](const valarray<bool>& v);
Returns a subset of the self as specified by s. The return value is a
mask_array referencing elements inside self. See mask_array.
valarray<;T> operator[](const valarray<size_t>& v) const;
Returns a subset of the self as specified by s. The return value is a new
valarray object.
Indirect_array<;T> operator[](const valarray<size_t>& v);
Returns a subset of the self as specified by s. The return value is a indi‐
rect_array referencing elements inside self. See indirect_array.
UNARY OPERATORS
valarray<T> operator+() const;
Returns a new valarray object of the same size as the array in self where
each element has been initialized by applying operator+ to the correspond‐
ing element in self. This operation can only be applied to a valarray
instantiated on a type T that supports an operator+ that returns T or a
type convertible to T.
valarray<;T> operator-() const;
Returns a new valarray object of the same size as the array in self where
each element has been initialized by applying operator- to the correspond‐
ing element in self. This operation can only be applied to a valarray
instantiated on a type T that supports an operator- returning T or a type
convertible to T.
valarray<;T> operator~() const;
Returns a new valarray object of the same size as the array in self where
each element has been initialized by applying operator~ to the correspond‐
ing element in self. This operation can only be applied to a valarray
instantiated on a type T that supports an operator~ returning T or a type
convertible to T.
valarray<;bool> operator!() const;
Returns a new valarray object of the same size as the array in self where
each element has been initialized by applying operator! to the correspond‐
ing element in self. This operation can only be applied to a valarray
instantiated on a type T that supports an operator! returning bool or a
type convertible to bool.
COMPUTED ASSIGNMENT OPERATORS
valarray<T>& operator*=(const valarray<T>& val);
valarray<T>& operator/=(const valarray<T>& val);
valarray<T>& operator%=(const valarray<T>& val);
valarray<T>& operator+=(const valarray<T>& val);
valarray<T>& operator-=(const valarray<T>& val);
valarray<T>& operator^=(const valarray<T>& val);
valarray<T>& operator&=(const valarray<T>& val);
valarray<T>& operator|=(const valarray<T>& val);
valarray<T>& operator<<=(const valarray<T>& val);
valarray<T>& operator>>=(const valarray<T>& val);
Applies the indicated operation to each element in self, using the corre‐
sponding element from val as the right hand argument (for example, for all
0 <= n < *this.size(), *this[n] += val[n]). This operation can only be
applied to a valarray instantiated on a type T that supports the indicated
operation. The length of val must also equal the length of self. Returns
self.
valarray<;T>& operator*=(const T& val);
valarray<;T>& operator/=(const T& val);
valarray<;T>& operator%=(const T& val);
valarray<;T>& operator+=(const T& val);
valarray<;T>& operator-=(const T& val);
valarray<;T>& operator^=(const T& val);
valarray<;T>& operator&=(const T& val);
valarray<;T>& operator|=(const T& val);
valarray<;T>& operator<<=(const T& val);
valarray<;T>& operator>>=(const T& val);
Applies the indicated operation to each element in self, using val as the
right hand argument (for example, for all 0 <= n < *this.size(), *this[n]
+= val). This operation can only be applied to a valarray instantiated on
a type T that supports the indicated operation. Returns self.
MEMBER FUNCTIONS
size_t size() const;
Returns the number of elements.
T sum() const;
This function uses operator+= to sum all the elements of the array. Sum can
only be called for a valarray instantiated on a type that supports opera‐
tor+=. The array must also have at least one element. Returns the sum of
all elements in the array.
T min() const;
This function uses operator< to find the minimum element in the array. The
array must have at least one element. Returns the minimum of all elements
in the array.
T max() const;
This function uses operator> to find the maximum element in the array. The
array must have at least one element. Returns the maximum of all elements
in the array.
valarray<;T> shift(int n) const;
This function returns a new valarray object whose elements have all been
shifted n places to left or right with respect to self. A positive value of
n shifts the elements to the left, a negative value to the right. The
default constructor for T is used to fill in behind the shifting elements.
For example, applying shift(2) to an array corresponding to [3,4,5,6]
results in [5,6,0,0], and applying shift(-1) to [3,4,5,6] results in
[0,3,4,5].
valarray<;T> cshift(int n) const;
This function returns a new valarray object whose elements have all been
rotated n places to left or right with respect to self. A positive value of
n shifts the elements to the left, a negative value to the right. For exam‐
ple, applying shift(2) to an array corresponding to [3,4,5,6] results in
[5,6,3,4], and applying shift(-1) to [3,4,5,6] results in [6,3,4,5].
valarray<;T> apply(T func(T)) const;
This function returns a new valarray object with the same length as the
array in self but whose elements have all been initialized by applying the
argument function func to the corresponding element in self (in other
words, for all n < *this.size(), the nth element of the returned array
equals func(*this[n])).
valarray<;T> apply(T func(const T&)) const;
This function returns a new valarray object with the same length as the
array in self but whose elements have all been initialized by applying the
argument function func to the corresponding element in self (in other
words, for all 0 <= n < *this.size(), the nth element of the returned
array equals func(*this[n])).
voidresize(size_type sz, T c = T());
Changes the length of self to sz, and assigns c to every element. This
function also invalidates all outstanding references to self.
NON-MEMBER BINARY OPERATORS
template <class T> valarray<T>
operator*(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator/(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator%(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator+(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator-(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator^(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator&(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator|(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator<<(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<T>
operator>>(const valarray<T>& lhs, const valarray<T>& rhs);
Returns a new valarray object of the same size as the argument arrays where
each element has been initialized by applying the indicated operation to
the corresponding elements in the argument arrays. The operation can only
be applied to a valarray instantiated on a type T that supports a form of
the indicated operation that returns T or a type convertible to T. The
argument arrays must have the same length.
template <;class T> valarray<T>
operator*(const valarray<;T>& lhs, T& rhs);
template <;class T> valarray<T>
operator/(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator%(const valarray<;T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator+(const valarray<;T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator-(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator^(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator&(const valarray<;T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator|(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator<;<(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<T>
operator>>(const valarray<T>& lhs, const T& rhs);
Returns a new valarray object of the same size as the valarray lhs where
each element has been initialized by applying the indicated operation to
the corresponding element in lhs and the value rhs. The operation can
only be used with a type T that supports a form of the indicated operation
that returns T or a type convertible to T.
template <;class T> valarray<T>
operator*(const T& rhs, valarray<T>& rhs);
template <;class T> valarray<T>
operator/(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator%(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator+(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator-(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator^(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator&(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator|(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator<;<(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<T>
operator>>(const T& lhs, const valarray<T>& rhs);
Returns a new valarray object of the same size as the valarray rhs where
each element has been initialized by applying the indicated operation to
the corresponding element in rhs and the value lhs. The operation can
only be used with a type T that supports a form of the indicated operation
that returns T or a type convertible to T.
NON-MEMBER LOGICAL OPERATORS
template <class T> valarray<bool>
operator==(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator!=(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator<(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator>(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator<=(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator>=(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator&&(const valarray<T>& lhs, const valarray<T>& rhs);
template <class T> valarray<bool>
operator||(const valarray<T>& lhs, const valarray<T>& rhs);
Returns a valarray<bool> object of the same size as the argument arrays
where each element has been initialized by applying the indicated operation
to the corresponding elements in the argument arrays. The operation can
only be applied to a valarray instantiated on a type T that support a form
of the indicated operation that returns bool or a type convertible to bool.
The argument arrays must have the same length.
template <;class T> valarray<bool>
operator==(const valarray<T>& lhs, T& rhs);
template <;class T> valarray<bool>
operator!=(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<bool>
operator<;(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<bool>
operator>(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<bool>
operator<;=(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<bool>
operator>=(const valarray<T>& lhs, const T& rhs);
template <;class T> valarray<bool>
operator&&(const valarray<;T>& lhs, const T& rhs);
template <;class T> valarray<bool>
operator||(const valarray<T>& lhs, const T& rhs);
Returns a valarray<bool> object of the same size as the valarray lhs where
each element has been initialized by applying the indicated operation to
the corresponding element in lhs and the value rhs. The operation can
only be used with a type T that supports a form of the indicated operation
that returns bool or a type convertible to bool.
template <;class T> valarray<bool>
operator==(const T& rhs, valarray<T>& rhs);
template <;class T> valarray<bool>
operator!=(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<bool>
operator<;(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<bool>
operator>(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<bool>
operator<;=(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<bool>
operator>=(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<bool>
operator&&(const T& lhs, const valarray<T>& rhs);
template <;class T> valarray<bool>
operator||(const T& lhs, const valarray<T>& rhs);
Returns a valarray<bool> object of the same size as the valarray rhs where
each element has been initialized by applying indicated operation to the
corresponding element in rhs and the value lhs. The operation can only be
used with a type T that supports a form of the indicated operation that
returns bool or a type convertible to bool.
NON-MEMBER TRANSCENDENTAL FUNCTIONS
template <class T> valarray<T> abs(const valarray<T>& v);
template <class T> valarray<T> acos(const valarray<T>& v);
template <class T> valarray<T> asin(const valarray<T>& v);
template <class T> valarray<T> atan(const valarray<T>& v);
template <class T> valarray<T> cos(const valarray<T>& v);
template <class T> valarray<T> cosh(const valarray<T>& v);
template <class T> valarray<T> exp(const valarray<T>& v);
template <class T> valarray<T> log(const valarray<T>& v);
template <class T> valarray<T> log10(const valarray<T>& v);
template <class T> valarray<T> sin(const valarray<T>& v);
template <class T> valarray<T> sinh(const valarray<T>& v);
template <class T> valarray<T> sqrt(const valarray<T>& v);
template <class T> valarray<T> tan(const valarray<T>& v);
template <class T> valarray<T> tanh(const valarray<T>& v);
Returns a new valarray object of the same size as the argument array where
each element has been initialized by applying the indicated transcendental
function to the corresponding elements in the argument array. The opera‐
tion can only be applied to a valarray instantiated on a type T that sup‐
ports a unique form of the indicated function that returns T or a type con‐
vertible to T.
template <;class T> valarray<T>
atan2(const valarray<;T>& v, const valarray<T>& v2);
template <;class T> valarray<T>
pow(const valarray<;T>& v, const valarray<T>& v2);
Returns a new valarray object of the same size as the argument arrays where
each element has been initialized by applying the indicated transcendental
function to the corresponding elements in the argument arrays. The opera‐
tion can only be applied to a valarray instantiated on a type T that sup‐
ports a unique form of the indicated function that returns T or a type con‐
vertible to T.
template <;class T> valarray<T>
atan2(const valarray<;T>& v, const T& v2);
template <;class T> valarray<T>
pow(const valarray<;T>& v, const T& v2);
Returns a new valarray object of the same size as the argument array v
where each element has been initialized by applying the indicated transcen‐
dental function to the corresponding elements in v along with the value v2.
The operation can only be applied to a valarray instantiated on a type T
that supports a unique form of the indicated function that returns T or a
type convertible to T.
template <;class T> valarray<T>
atan2(const T& v, const valarray<T> v2);
template <;class T> valarray<T>
pow(const T& v, const valarray<T> v2);
Returns a new valarray object of the same size as the argument array v2
where each element has been initialized by applying the indicated transcen‐
dental function to the corresponding elements in v2 along with the value v.
The operation can only be applied to a valarray instantiated on a type T
that supports a unique form of the indicated function that returns T or a
type convertible to T.
EXAMPLE
//
// valarray.cpp
//
#include "valarray.h" // Contains a valarray stream inserter
using namespace std;
int main(void)
{
int ibuf[10] = {0,1,2,3,4,5,6,7,8,9};
int ibuf2[10] = {10,11,12,13,14,15,16,17,18,19};
// create 2 valarrays of ints
valarray<int> vi(ibuf,10);
valarray<int> vi2(ibuf2,10);
// print them out
cout << vi << endl << vi2 << endl;
vi += vi2;
vi2 *= 2;
valarry<int> vi3 = vi2 % vi;
// print them out again
cout << vi << endl << vi2 << endl << vi3 << endl;
return 0;
}
Rogue Wave Software 02 Apr 1998 valarray(3C++)
