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Книга: Standard Template Library Programmer

greater

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Description
Example
Definition
Template parameters
Model of
Type requirements
Public base classes
Members
New members
See also

greater<T>

Category: functors

Component type: type

Description

Greater<T> is a function object. Specifically, it is an Adaptable Binary Predicate, which means it is a function object that tests the truth or falsehood of some condition. If f is an object of class greater<T> and x and y are objects of class T, then f(x,y) returns true if x > y and false otherwise.

Example

Sort a vector in descending order, rather than the default ascending order.

vector<int> V; … sort(V.begin(), V.end(), greater<int>());

Definition

Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h.

Template parameters

Parameter	Description
`T`	The type of greater's arguments.

Model of

Adaptable Binary Predicate, DefaultConstructible

Type requirements

T is LessThan Comparable.

Public base classes

binary_function <T, T, bool>.

Members

Member	Where defined	Description
`first_argument_type`	Adaptable Binary Predicate	The type of the first argument: T
`second_argument_type`	Adaptable Binary Predicate	The type of the second argument: T
`result_type`	Adaptable Binary Predicate	The type of the result: bool
`greater()`	DefaultConstructible	The default constructor.
`bool operator()(const T& x, const T& y)`	Binary Function	Function call operator. The return value is x > y.

New members

All of greater's members are defined in the Adaptable Binary Predicate and DefaultConstructible requirements. Greater does not introduce any new members.