boost::urls::params_base::get_or

Return the value for a key or a fallback

Synopsis

Declared in <boost/url/params_base.hpp>

std::string
get_or(
    core::string_view key,
    core::string_view value = {},
    ignore_case_param ic = {}) const;

Description

This convenience function searches for the first parameter matching key and returns its decoded value. If no parameter with the specified key exists, the provided fallback value is returned instead. When the key is found but the parameter has no value, an empty string is returned.

Example

url_view u( "/path?first=John&last=Doe" );
assert( u.params().get_or( "first", "n/a" ) == "John" );
assert( u.params().get_or( "missing", "n/a" ) == "n/a" );

Complexity

Linear in this‐>buffer().size().

Exception Safety

Calls to allocate may throw.

Return Value

The decoded value or the fallback.

Parameters

Name Description

key

The key to match.

value

The fallback string returned when no matching key exists. If this parameter is omitted, an empty string is used.

ic

Optional case‐insensitive compare indicator.

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