How do the placeholders actually get the arguments applied? I have read through parts of the metaprogramming book and the documentation. It's obvious to me how something like _1 (arg<1>) selects its argument. I haven't been able to figure out is how it gets the arguments in the first place considering the Lambda expression is not something like _1(5) in most of the examples I have found. My template skills are weak, and I am attempting to sharpen my them (and metaprogramming skills). Thank you in advance. Sincerely, Joseph L. McCay
Joe McCay
How do the placeholders actually get the arguments applied? I have read through parts of the metaprogramming book and the documentation. It's obvious to me how something like _1 (arg<1>) selects its argument. I haven't been able to figure out is how it gets the arguments in the first place considering the Lambda expression is not something like _1(5) in most of the examples I have found. My template skills are weak, and I am attempting to sharpen my them (and metaprogramming skills).
Are you asking about runtime lambda expressions as in the Boost Lambda library, or compile-time lambda expressions as in MPL? -- Dave Abrahams Boost Consulting www.boost-consulting.com
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David Abrahams -
Joe McCay