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## Macro BOOST_SCOPE_EXIT_CONFIG_USE_LAMBDAS

BOOST_SCOPE_EXIT_CONFIG_USE_LAMBDAS — Force to use C++11 lambda functions to implement scope exits.

## Synopsis

    // In header: <boost/scope_exit.hpp>

    BOOST_SCOPE_EXIT_CONFIG_USE_LAMBDAS

## Description

If programmers define this configuration macro on a C++11 compiler for which the Boost.Config macro `BOOST_NO_LAMBDAS` is not defined, the `BOOST_SCOPE_EXIT` and `BOOST_SCOPE_EXIT_TPL` macros will use C++11 lambda functions to declare scope exits. By default this macro is not defined.

Warning: When scope exits are implemented using lambda functions, the syntax of the capture list follows the exact same syntax of C++11 lambda captures which is in general different from the legacy capture syntax of this library. For example, C++11 lambdas require to capture data members by capturing the object `this` while this library always allowed to capture data members directly. Therefore, when this configuration macro is defined, `BOOST_SCOPE_EXIT` and `BOOST_SCOPE_EXIT_TPL` are no longer backward compatible (and this is why this macro is not defined by default).

A semicolon `;` can be used instead of `BOOST_SCOPE_EXIT_END` when this configuration macro is defined (but it is recommended to always use `BOOST_SCOPE_EXIT_END` so to maximize portability).

Note: This configuration macro does not control the definition of `BOOST_SCOPE_EXIT_ALL` which is always and automatically defined on compilers that support C++11 lambda functions.

See: `BOOST_SCOPE_EXIT`, `BOOST_SCOPE_EXIT_TPL`, `BOOST_SCOPE_EXIT_END`.