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Seeking algorithm: find last greater than

I have a sorted vector of structs, each containing a upper limit of a
range:

struct Datum
{
double upper_limit;
// other stuff
};

std::vector<Dat umdata;

Given an input value, I want to find the structure that goes with this
value.

Is there a simple STL idiom to search the vector for the matching
structure?

I'm thinking I need to iterate from rbegin() to rend() until I find (p->
upper_limit input) and then return --(p->base()).
Jul 14 '08 #1
1 1543
Kenneth Porter wrote:
I have a sorted vector of structs, each containing a upper limit of a
range:

struct Datum
{
double upper_limit;
// other stuff
};

std::vector<Dat umdata;

Given an input value, I want to find the structure that goes with this
value.

Is there a simple STL idiom to search the vector for the matching
structure?

I'm thinking I need to iterate from rbegin() to rend() until I find (p->
upper_limit input) and then return --(p->base()).
Sounds like you might want to use std::lower_boun d or std::upper_boun d.

--
Daniel Pitts' Tech Blog: <http://virtualinfinity .net/wordpress/>
Jul 14 '08 #2

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