boost::urls::params_base::contains :: Boost Libraries Documentation

# boost::urls::params_base::contains

Return true if a matching key exists

## Synopsis

Declared in `<boost/url/params_base.hpp>`

    bool
    contains(
        core::string_view key,
        ignore_case_param ic = {}) const noexcept;

## Description

This function examines the parameters in the container to find a match for the specified key. The comparison is performed as if all escaped characters were decoded first.

## Example

    assert( url_view( "?first=John&last=Doe" ).params().contains( "first" ) );

## Complexity

Linear in `this‐>buffer().size()`.

## Exception Safety

Throws nothing.

## Return Value

`true` if a matching key exists.

## Parameters

Name | Description
--- | ---
key | The key to match. By default, a case‐sensitive comparison is used.
ic | An optional parameter. If the value `ignore_case` is passed here, the comparison is case‐insensitive.

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