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## Function template replace_head

boost::algorithm::replace_head — Replace head algorithm.

## Synopsis

    template<typename SequenceT, typename CollectionT>
      void replace_head(SequenceT & Input, unsigned int N,
                        const CollectionT & Format);

## Description

Replace the head of the input with the given format string. The head is a prefix of a string of given size. If the sequence is shorter then required, the whole string is considered to be the head. The input sequence is modified in-place.

Parameters

Format

  A substitute string

Input

  An input string

N

  Length of the head

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