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std::forward_list::before_begin, std::forward_list::cbefore_begin

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Template:ddcl list begin <tr class="t-dcl ">

<td >
iterator before_begin();
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

<td >
const_iterator before_begin() const;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

<td >
const_iterator cbefore_begin() const;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

Returns an iterator to the element before the first element of the container. This element acts as a placeholder, attempting to access it results in undefined behavior. The only usage cases are in functions Template:rlpf, Template:rlpf, Template:rlpf, Template:rlpf and the increment operator: incrementing the before-begin iterator gives exactly the same iterator as obtained from begin()/cbegin().

Contents

Parameters

(none)

Return value

iterator to the element before the first element

Exceptions

1-3)
noexcept specification:  
noexcept
  

Complexity

Constant

See also

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