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kwijibo28 · Guest

Hi all,

I am considering using the TNT library for some application.

http://math.nist.gov/tnt/

While reading the online documentation they state that you can create
and initialize an Array2D class the following way:

Array2D< double > A(M,N) = 0.0; /* create MxN array; all zeros */ (1)

http://math.nist.gov/tnt/examples.html

When I saw this I was a little intrigue. Is it possible to create an
instance using Array2D<double>(int,int) constructor and in the same
expression use the operator=(double) to assign its content? Or perhaps
this is just alternative syntax for calling the following constructor:

Array2D< double > A(M,N,0.0); (2)

which is provided by the class Array2D<double>.

Anyway I've tried to compile line (1) on my compiler and it failed,
just as I expect it. Compiler is expecting a semicolon after the
closing parenthesis. Even if TNT documentation say it should compile.

Another way to achieve the same thing would be to write something
like:

Array2D< double > A(M,N); (3a)
A = 0.0; (3b)

Is my compiler faulty in this regard or TNT documentation erronous? I
must admit the syntax of (1) is more elegant than (2) or (3). But I'm
not sure this is valid C++. If (1) is equivalent to (2) than maybe all
these years I could have write this:

std::vector<int> a(10) = 100; instead of
std::vector<int> a(10,100);

Any comments on this would appreciated.

Kwijibo28

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kanze@gabi-soft.fr · Guest

kwijibo28 wrote:

msalters · Guest

kwijibo28 wrote: