xtd::expressions::constant< constant_value > Struct Template Reference

Inheritance diagram for xtd::expressions::constant< constant_value >:

Definition

template<auto constant_value>
struct xtd::expressions::constant< constant_value >

The xtd::expressions::constant is the constant wrapper.

Namespace

xtd::expressions

Header

#include <xtd/expressions/constant>

Library

xtd.core

Examples

The following example shows how to use xtd::expressions::expression::constant.

#include <xtd/xtd>
 
auto main() -> int {
  // auto constant1 = [] {return 10;};
  auto constant1 =  constant<10> {};
  println("constant1 result => {}", constant1());
  auto constant2 =  expression::constant<10>();
  println("constant2 result => {}", constant2());
  auto value = 30;
  //auto constant3 = [value] {return value;};
  auto constant3 =  constant<value> {};
  println("constant3 result => {}", constant3());
  auto constant4 =  expression::constant<value>();
  println("constant4 result => {}", constant4());
  println();
  //auto expr1 = [value] {return 20 + value;};
  auto expr1 = constant<20> {} + expression::constant<value>();
  println("expr1 result => {}", expr1());
}
 
// This code produces the following output :
//
// constant1 result => 10
// constant2 result => 10
// constant3 result => 30
// constant4 result => 30
//
// expr1 result => 50

Public Fields
static constexpr operator_precedence	precedence
	The operator precedence. That contains one of xtd::expressions::operator_precedence values.

Public Constructors
constexpr	constant ()=default
	Initialize a new xtd::expressions::constant object.

Public Operators
constexpr auto	operator() (auto &&...) const
	Gets the constant value.

Additional Inherited Members

Constructor & Destructor Documentation

constant()

template<auto constant_value>

xtd::expressions::constant< constant_value >::constant ( )

constexprdefault

Initialize a new xtd::expressions::constant object.

Member Function Documentation

operator()()

template<auto constant_value>

auto xtd::expressions::constant< constant_value >::operator() ( auto && ... ) const

inlineconstexpr

Gets the constant value.

Returns

The constant value.

Member Data Documentation

precedence

template<auto constant_value>

operator_precedence xtd::expressions::constant< constant_value >::precedence

staticconstexpr

The operator precedence. That contains one of xtd::expressions::operator_precedence values.

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The documentation for this struct was generated from the following file:

• xtd.core/include/xtd/expressions/constant.hpp