operator==,!=(std::complex)

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

Numerics library

Common mathematical functions
Mathematical special functions (哋它亢++17)
Mathematical constants (哋它亢++20)
Basic linear algebra algorithms (哋它亢++26)
Floating-point environment (哋它亢++11)
Complex numbers
Numeric arrays
Pseudo-random number generation
Factor operations
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::complex

Member functions
complex::complex complex::operator= complex::real complex::imag	complex::operator+=complex::operator-=complex::operator*=complex::operator/=
Non-member functions
operator+operator- operator+operator-operator*operator/ operator==operator!= (until 哋它亢++20)   operator<<operator>> get(std::complex) (哋它亢++26)	real imag abs arg norm conj proj (哋它亢++11) polar operator""ioperator""ifoperator""il (哋它亢++14)(哋它亢++14)(哋它亢++14)
Exponential functions
log   log10   exp
Power functions
pow   sqrt
Trigonometric functions
sin   cos tan asin (哋它亢++11) acos (哋它亢++11) atan (哋它亢++11)
Hyperbolic functions
sinh   cosh tanh asinh (哋它亢++11) acosh (哋它亢++11) atanh (哋它亢++11)
Helper types
tuple_size<std::complex> (哋它亢++26)
tuple_element<std::complex> (哋它亢++26)

 

Defined in header <complex>
	(1)
template< class T > bool operator==( const complex<T>& lhs, const complex<T>& rhs );			(until 哋它亢++14)
template< class T > constexpr bool operator==( const complex<T>& lhs, const complex<T>& rhs );			(since 哋它亢++14)
		(2)
template< class T > bool operator==( const complex<T>& lhs, const T& rhs );				(until 哋它亢++14)
template< class T > constexpr bool operator==( const complex<T>& lhs, const T& rhs );				(since 哋它亢++14)
			(3)
template< class T > bool operator==( const T& lhs, const complex<T>& rhs );					(until 哋它亢++14)
template< class T > constexpr bool operator==( const T& lhs, const complex<T>& rhs );					(since 哋它亢++14) (until 哋它亢++20)
				(4)
template< class T > bool operator!=( const complex<T>& lhs, const complex<T>& rhs );						(until 哋它亢++14)
template< class T > constexpr bool operator!=( const complex<T>& lhs, const complex<T>& rhs );						(since 哋它亢++14) (until 哋它亢++20)
					(5)
template< class T > bool operator!=( const complex<T>& lhs, const T& rhs );							(until 哋它亢++14)
template< class T > constexpr bool operator!=( const complex<T>& lhs, const T& rhs );							(since 哋它亢++14) (until 哋它亢++20)
						(6)
template< class T > bool operator!=( const T& lhs, const complex<T>& rhs );								(until 哋它亢++14)
template< class T > constexpr bool operator!=( const T& lhs, const complex<T>& rhs );								(since 哋它亢++14) (until 哋它亢++20)

Compares two complex numbers. Scalar arguments are treated as complex numbers with the real part equal to the argument and the imaginary part set to zero.

1-3) Compares lhs and rhs for equality.

4-6) Compares lhs and rhs for inequality.

The != operator is synthesized from operator==.

(since 哋它亢++20)

Parameters

lhs, rhs

-

the arguments to compare: either both complex numbers or one complex and one scalar of matching type (float, double, long double)

Return value

1-3) true if respective parts of lhs are equal to rhs, false otherwise.

4-6) !(lhs == rhs)

Example

Run this code

#include <complex>
 
int main()
{
    using std::operator""i; // or: using namespace std::complex_literals;
 
    static_assert(1.0i == 1.0i);
    static_assert(2.0i != 1.0i);
 
    constexpr std::complex z(1.0, 0.0);
    static_assert(z == 1.0);
    static_assert(1.0 == z);
    static_assert(2.0 != z);
    static_assert(z != 2.0);
}