Slightly scary

test.bash

#!/bin/bash
set +H

path=`find src/ -type f`

ssed -i "s/using namespace std;//" $path;
ssed -i "s/using std::.*//" $path;

# std-ize templates
for symbol in stack map list vector queue set pair priority_queue make_shared dynamic_pointer_cast numeric_limits back_insert_iterator
do
    echo $symbol;
    ssed -i -R "s/(?<![>\._A-Za-z])(?<!::)(?<! <)(?<!\/)$symbol(?=<)/std::$symbol/g" $path;
done

# std-ize symbols
for symbol in istream ifstream ostream ofstream stringstream cin cout dec hex endl flush _S_failbit runtime_error string less equal_to logical_and transform ios exception
do
    echo $symbol;
    ssed -i -R "s/(?<![>\._A-Za-z])(?<!::)(?<!include <)(?<!\/)$symbol(?![_A-Za-z])/std::$symbol/g" $path;
done

# std-ize functions/constructors
for symbol in runtime_error max setprecision exception
do
    echo $symbol;
    ssed -i -R "s/(?<![>\._A-Za-z])(?<!::)(?<! <)(?<!\/)$symbol(?=\()/std::$symbol/g" $path;
done