# Broken Compiler Workarounds

Overview
Reference

1. Standard header `<ios>`
2. Templated Streams
3. Templated Stream Buffers
4. Character Traits
5. Chain Component Access

## Overview

The Boost Iostreams library contains several macros useful for writing code which works with compilers which fail to support certain core language features and with defective standard library implementations, such as those which do not provide template streams.

## Reference

### 1. Standard header `<ios>`

### Headers

`<boost/iostreams/detail/ios.hpp>`

### Synopsis

    #define BOOST_IOSTREAMS_BASIC_IOS(ch, tr) ...
    #define BOOST_IOS ...
    #define BOOST_IOSTREAMS_FAILURE ...

#### `BOOST_IOSTREAMS_BASIC_IOS`

Expands to `std::basic_ios<ch, tr>` for standard libraries which support templated streams, and to `std::ios` otherwise.

#### `BOOST_IOS`

Expands to `std::ios_base` if available, and to `std::ios` otherwise. To access the nested class `std::ios_base::failure`, use `BOOST_IOSTREAMS_FAILURE`.

#### `BOOST_IOSTREAMS_FAILURE`

Expands to `std::ios_base::failure` if available, and to a suitable derived class of `std::exception` otherwise.

### 2. Templated Streams

### Headers

`<boost/iostreams/detail/iostream.hpp>`

### Synopsis

    #define BOOST_IOSTREAMS_BASIC_ISTREAM(ch, tr) ...
    #define BOOST_IOSTREAMS_BASIC_OSTREAM(ch, tr) ...
    #define BOOST_IOSTREAMS_BASIC_IOSTREAM(ch, tr) ...

#### `BOOST_IOSTREAMS_BASIC_ISTREAM`

Expands to `std::basic_istream<ch, tr>` for standard libraries which support templated streams, and to `std::istream` otherwise.

#### `BOOST_IOSTREAMS_BASIC_OSTREAM`

Expands to `std::basic_ostream<ch, tr>` for standard libraries which support templated streams, and to `std::ostream` otherwise.

#### `BOOST_IOSTREAMS_BASIC_IOSTREAM`

Expands to `std::basic_iostream<ch, tr>` for standard libraries which support templated streams, and to `std::iostream` otherwise.

### 3. Templated Stream Buffers

### Headers

`<boost/iostreams/detail/streambuf.hpp>`

### Synopsis

    #define BOOST_IOSTREAMS_BASIC_STREAMBUF(ch, tr) ...
    #define BOOST_IOSTREAMS_PUBSEEKOFF ...
    #define BOOST_IOSTREAMS_PUBSEEKPOS ...
    #define BOOST_IOSTREAMS_PUBSYNC ...

#### `BOOST_IOSTREAMS_BASIC_STREAMBUF`

Expands to `std::basic_streambuf<ch, tr>` for standard libraries which support `std::basic_streambuf`, and to `std::streambuf` otherwise.

#### `BOOST_IOSTREAMS_PUBSEEKOFF`

Expands to `pubseekoff` for standard libraries which support `std::basic_streambuf::pubseekoff`, and to `seekoff` otherwise.

#### `BOOST_IOSTREAMS_PUBSEEKPOS`

Expands to `pubseekpos` for standard libraries which support `std::basic_streambuf::pubseekpos`, and to `seekpos` otherwise.

#### `BOOST_IOSTREAMS_PUBSYNC`

Expands to `pubsync` for standard libraries which support `std::basic_streambuf::pubsync`, and to `sync` otherwise.

### 4. Character Traits

### Headers

`<boost/iostreams/detail/char_traits.hpp>`

### Synopsis

    #define BOOST_IOSTREAMS_CHAR_TRAITS(ch) ...

#### `BOOST_IOSTREAMS_CHAR_TRAITS`

Expands to `std::char_traits<ch>` for standard libraries which support `std::char_traits`, and to a substitute for `std::char_traits<char>` otherwise.

### 5. Chain Component Access

### Headers

`<boost/iostreams/chain.hpp>`

### Synopsis

    #define BOOST_IOSTREAMS_COMPONENT_TYPE(chain, n) ...
    #define BOOST_IOSTREAMS_COMPONENT(chain, n, t) ...

#### `BOOST_IOSTREAMS_COMPONENT_TYPE`

Used in place of `chain.component_type(n)` for compilers which don't support explicit specification of member function template arguments. `chain` can be an instance of `filtering_stream`, `filtering_streambuf` or `basic_chain`.

This macro is deprecated. Use `chain.component_type(n)` instead.

#### `BOOST_IOSTREAMS_COMPONENT`

Used in place of `chain.component<t>(n)` for compilers which don't support explicit specification of member function template arguments. `chain` can be an instance of `filtering_stream`, `filtering_streambuf` or `basic_chain`.

Revised 02 Feb 2008

© Copyright 2008 CodeRage, LLC
© Copyright 2004-2007 Jonathan Turkanis
Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)