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stl中的运算子_stl_list.h

作者：weixin_40725706 | 2024-02-22 02:18:16

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stl_list.h

今天终于明白了下面这些的区别:

Adaptor and conversion functions

Negators

not1

Return negation of unary function object (function template )

not2

Return negation of binary function object (function template )

Parameter binders

bind1st

Return function object with first parameter bound (function template )

bind2nd

Return function object with second parameter bound (function template )

Conversors

ptr_fun

Convert function pointer to function object (function template )

mem_fun

Convert member function to function object (pointer version) (function template )

mem_fun_ref

Convert member function to function object (reference version) (function template )

这几个是function template，而剩下的都是class template。并且这些function template的实现里面用到了其他的class template的定义。

header

<functional>

Function objects

Function objects are objects specifically designed to be used with a syntax similar to that of functions. In C++, this is achieved by defining member function operator() in their class, like for example:


struct myclass {
  int operator()(int a) {return a;}
} myobject;
int x = myobject (0);           // function-like syntax with object myobject

They are especially useful as predicates or comparison functions to be used with standard algorithms .
The standard library provides standard definitions for several function objects and some ways to modify and adapt their behavior in header <functional> :

Base classes :

unary_function

Unary function object base class (class template )

binary_function

Binary function object base class (class template )

Operator classes

Arithmetic operations :

plus

Addition function object class (class template )

minus

Subtraction function object class (class template )

multiplies

Multiplication function object class (class template )

divides

Division function object class (class template )

modulus

Modulus function object class (class template )

negate

Negative function object class (class template )

Comparison operations :

equal_to

Function object class for equality comparison (class template )

not_equal_to

Function object class for non-equality comparison (class template )

greater

Function object class for greater-than inequality comparison (class template )

less

Function object class for less-than inequality comparison (class template )

greater_equal

Function object class for greater-than-or-equal-to comparison (class template )

less_equal

Function object class for less-than-or-equal-to comparison (class template )

Logical operations :

logical_and

Logical AND function object class (class template )

logical_or

Logical OR function object class (class template )

logical_not

Logical NOT function object class (class template )

Adaptor and conversion functions

Negators

not1

Return negation of unary function object (function template )

not2

Return negation of binary function object (function template )

Parameter binders

bind1st

Return function object with first parameter bound (function template )

bind2nd

Return function object with second parameter bound (function template )

Conversors

ptr_fun

Convert function pointer to function object (function template )

mem_fun

Convert member function to function object (pointer version) (function template )

mem_fun_ref

Convert member function to function object (reference version) (function template )

Instrumental types

unary_negate

Negate unary function object class (class template )

binary_negate

Negate binary function object class (class template )

binder1st

Generate function object class with 1st parameter bound (class template )

binder2nd

Generate function object class with 2nd parameter bound (class template )

pointer_to_unary_function

Generate unary function object class from pointer (class template )

pointer_to_binary_function

Generate binary function object class from pointer (class template )

mem_fun_t

Generate function object class from parameterless member (pointer version) (class template )

mem_fun1_t

Generate function object class from single-parameter member (pointer version) (class template )

const_mem_fun_t

Generate function object class from const parameterless member (pointer version) (class template )

const_mem_fun1_t

Generate function object class from single-parameter const member (pointer version) (class template )

mem_fun_ref_t

Generate function object class from parameterless member (reference version) (class template )

mem_fun1_ref_t

Generate function object class from single-parameter member (reference version) (class template )

const_mem_fun_ref_t

Generate function object class from const parameterless member (reference version) (class template )

const_mem_fun1_ref_t

Generate function object class from single-parameter const member (reference version) (class template )

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