Subject: [Boost-bugs] [Boost C++ Libraries] #6590: BOOST_AUTO fails on C++11 lambdas
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-02-21 22:46:09
#6590: BOOST_AUTO fails on C++11 lambdas
----------------------------------------------+-----------------------------
Reporter: Anders Kaseorg <andersk@â¦> | Owner: burbelgruff
Type: Feature Requests | Status: new
Milestone: To Be Determined | Component: typeof
Version: Boost 1.48.0 | Severity: Problem
Keywords: |
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`BOOST_AUTO` fails on C++11 lambdas as follows (tested with g++
4.6.2-14ubuntu2):
{{{
#!C++
#include <boost/typeof/typeof.hpp>
BOOST_AUTO(f, [](){});
}}}
{{{
$ g++ -c -std=c++0x test.cc
test.cc:2:1: error: lambda-expression in unevaluated context
test.cc:2:1: error: conversion from â<lambda()>â to non-scalar type
â<lambda()>â requested
}}}
Although itâs apparently not possible to use `typeof` or `decltype` on a
lambda expression, this could be fixed by defining `BOOST_AUTO` with C++11
`auto` on compilers that support it:
{{{
#!C++
#define BOOST_AUTO(Var, Expr) auto Var = Expr
BOOST_AUTO(f, [](){});
}}}
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/6590> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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