boost::urls::params_encoded_ref::set

Set a value

Synopsis

Declared in <include/boost/url/params_encoded_ref.hpp>


iterator
set(
    pct_string_view key,
    pct_string_view value,
    ignore_case_param ic = = {});

Description

This function performs one of two actions depending on the value of `this->contains( key, ic )`.

If key is contained in the view then one of the matching params has its value changed to the specified value. The remaining params with a matching key are erased. Otherwise,

If `key` is not contained in the view, then the function apppends the param `{ key, value }`.

All iterators are invalidated.

NOTE

The strings passed in must not come from the element being replaced, or else the behavior is undefined.


url u( "?id=42&id=69" );

u.encoded_params().set( "id", "none" );

assert( u.encoded_params().count( "id" ) == 1 );


this->count( key, ic ) == 1 && this->find( key, ic )->value == value

Linear in `this->url().encoded_query().size()`.

Strong guarantee.

Calls to allocate may throw. Exceptions thrown on invalid input.

Exceptions

Name	Thrown on
`key`	or `value` contain an invalid percent-encoding.

Return Value

An iterator to the appended or modified element.

Parameters

Name	Description
key	The key to match. By default, a case-sensitive comparison is used.
value	The value to assign. The empty string still counts as a value. That is, `has_value` for the element is true.
ic	An optional parameter. If the value ignore_case is passed here, the comparison is case-insensitive.